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How Does AuthSMTP Work?

What is AuthSMTP?

Customer Reviews & Testimonials

AuthSMTP Features

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Why Choose Us?

AuthSMTP solves these (and more) common outgoing mail problems

SMTP Outgoing Mail Relay - Anti-Virus Scanning

Outgoing SMTP Email Service for Mobile / Cell Phone, PDA and iPhone Users

Outgoing SMTP Email Service for Home and Small Business

Outgoing SMTP Email Service for Mail Server Administrators

Does your ISP not let you use your domain name when sending mail?

Outgoing SMTP email service with control panel and detailed statistics of sent emails and errors

Do you need to send large emails which are blocked by your ISP?

Need to keep duplicate copies of emails sent?

Are the current mail servers you use unreliable or overloaded?

Your Internet Provider does not provide SMTP servers?

Does your SMTP server get blacklisted / email rejected?

SMTP Relay Service - Product Information

Do you use multiple Internet connections or get 'Relaying Denied' errors?

Like the extra security of virus scanning your outgoing email?

Outgoing SMTP Email Service for Mailing List Distribution

AuthSMTP - The Global SMTP Service

Technical Support

Service Status

Control Panel Login

Frequently Asked Questions

Getting Started Guide [Downloadable PDF]

Browser Check

Software Setup Guides

Troubleshooting

Account Verification

Getting Started Guide

SMTP Diagnostic Program

AuthSMTP API Access v1.01

Help & Support

Documentation

Sitemap

Can Spam Act of 2003 [Downloadable PDF]

Acceptable Usage Policy

Web Site Disclaimer

Copyright Notice

Terms & Conditions

Privacy Policy

Cookie Policy

CAN-SPAM Act of 2003

Legal Documentation

Setup Guides

Android 2.x - Alternative Port - Setup Guide

Android 2.x - Default Port - Setup Guide

Android 2.x - Setup Details

Android 4.x (KitKat) - Alternative Port - Setup Guide

Android 4.x (KitKat) - Default Port - Setup Guide

Android 4.x - Kitkat - Setup Details

Android 5.x (Lollipop) - Alternative Port - Setup Guide

Android 5.x (Lollipop) - Default Port - Setup Guide

Android 5.x - Lollipop - Setup Details

Apple Mac OS X Server - Setup Guide

Apple Mobile Me - Remote SMTP - Setup Guide

Apple iPad - Pre iOS 7 - Alternate Port - Setup Guide

Apple iPad - Pre iOS 7 - Default Port - Setup Guide

Apple iPad - Pre iOS 7 - Setup Guide

Apple iPad - iOS10 - Setup Guide

Apple iPad - iOS11 - Setup Guide

Apple iPad - iOS7 - Setup Guide

Apple iPad - iOS8 - Setup Guide

Apple iPad - iOS9 - Setup Guide

Apple iPhone / iPod Touch - iOS10 - Setup Guide

Apple iPhone / iPod Touch - iOS11 - Setup Guide

Apple iPhone / iPod Touch - iOS3 - Setup Guide

Apple iPhone / iPod Touch - iOS4 - Setup Guide

Apple iPhone / iPod Touch - iOS5 - Setup Guide

Apple iPhone / iPod Touch - iOS6 - Setup Guide

Apple iPhone / iPod Touch - iOS7 - Setup Guide

Apple iPhone / iPod Touch - iOS8 - Setup Guide

Apple iPhone / iPod Touch - iOS9 - Setup Guide

BVRP Mobile Phone Tools - Setup Guide

CodeWorxTech PHP Mailer 2.x - SMTP Setup Guide

CodeWorxTech PHP Mailer 5.x - SMTP Setup Guide

CyruSoft Mulberry 3 - Alternate Port - Setup Guide

CyruSoft Mulberry 3 - Default Port - Setup Guide

CyruSoft Mulberry 3.x Setup Details

CyruSoft Mulberry 4 - Alternate Port - Setup Guide

CyruSoft Mulberry 4 - Default Port - Setup Guide

Cyrusoft Mulberry 4.x Setup Details

Enable SMTP Protocol Logging In Microsoft Exchange 2000, 2007, 2010, 2013, 2016

Entourage 2001 for Mac - Alternate Port - Setup Guide

Entourage 2001 for Mac - Default Port - Setup Guide

Entourage 2001 for Mac Setup Details

Entourage for Mac - Alternate Port - Setup Guide

Entourage for Mac - Default Port - Setup Guide

Entourage for Mac Setup Details

Eudora 6.x for Mac Setup Details

Exim 4.x SMTP Mail Transfer Agent for Linux and Unix - Setup Guide

General Instructions for configuring AuthSMTP

Gmail Webmail - Remote SMTP Server - Setup Guide

Incredimail XE - Alternate Port - Setup Guide

Incredimail XE - Default Port - Setup Guide

Incredimail XE Setup Details

Infacta GroupMail 5 - Setup Guide

Infacta GroupMail 6 - Setup Guide

Mac Mail - El Capitan 10.11 - Alternate Port - Setup Guide

Mac Mail - El Capitan 10.11 - Default Port - Setup Guide

Mac Mail - El Capitan 10.11 - Setup Details

Mac Mail - Leopard 10.5 - Alternate Port - Setup Guide

Mac Mail - Leopard 10.5 - Default Port - Setup Guide

Mac Mail - Leopard 10.5 - Mac Mail Setup Details

Mac Mail - Lion 10.7 - Alternate Port - Setup Guide

Mac Mail - Lion 10.7 - Default Port - Setup Guide

Mac Mail - Lion 10.7 - Mac Mail Setup Details

Mac Mail - Mavericks 10.9 - Alternate Port - Setup Guide

Mac Mail - Mavericks 10.9 - Default Port - Setup Guide

Mac Mail - Mavericks 10.9 - Mac Mail Setup Details

Mac Mail - Mountain Lion 10.8 - Alternate Port - Setup Guide

Mac Mail - Mountain Lion 10.8 - Default Port - Setup Guide

Mac Mail - Snow Leopard 10.6 - Alternate Port - Setup Guide

Mac Mail - Snow Leopard 10.6 - Default Port - Setup Guide

Mac Mail - Snow Leopard 10.6 - Mac Mail Setup Details

Mac Mail - Tiger 10.4 - Alternate Port - Setup Guide

Mac Mail - Tiger 10.4 - Default Port - Setup Guide

Mac Mail - Tiger 10.4 - Mac Mail Setup Details

Mac Mail - Yosemite 10.10 - Alternate Port - Setup Guide

Mac Mail - Yosemite 10.10 - Default Port - Setup Guide

Mac Mail - Yosemite 10.10 - Setup Details

Max Bulk Mailer - Alternate Port - Setup Guide

Max Bulk Mailer - Default Port - Setup Guide

Max Bulk Mailer 6.x / 7.x / 8.x

Microsoft Exchange 2000 - SMTP Setup Guide

Microsoft Exchange 2003 - SMTP Setup Guide

Microsoft Exchange 2007 - Alternative Port

Microsoft Exchange 2007 - Disable non-delivery reports (NDR / DSN)

Microsoft Exchange 2007 - SMTP Connector Setup Guide

Microsoft Exchange 2007 - SSL/TLS Setup

Microsoft Exchange 2007 - Setup Guide

Microsoft Exchange 2010 - Change to alternative port

Microsoft Exchange 2010 - Disable non-delivery reports (NDR / DSN)

Microsoft Exchange 2010 - SMTP Connector - Setup Guide

Microsoft Exchange 2010 - SSL/TLS

Microsoft Exchange 2010 - Setup Guide

Microsoft Exchange 2013 - Alternative Port

Microsoft Exchange 2013 - Disable non-delivery reports (NDR / DSN)

Microsoft Exchange 2013 - SMTP Connector - Setup Guide

Microsoft Exchange 2013 - SSL/TLS

Microsoft Exchange 2013 - Setup Guide

Microsoft Exchange 2016 - Alternative Port

Microsoft Exchange 2016 - Disable non-delivery reports (NDR / DSN)

Microsoft Exchange 2016 - SMTP Connector - Setup Guide

Microsoft Exchange 2016 - Setup Guide

Microsoft Messaging - Windows Mobile 6 - Setup Guide

Microsoft Office 365 - Exchange Online - SMTP Connector Smarthost

Microsoft Office 365

Microsoft Outlook 2000 - Alternate Port - Setup Guide

Microsoft Outlook 2000 - Default Port - Setup Guide

Microsoft Outlook 2000 - Setup Details

Microsoft Outlook 2002 - Alternate Port - Setup Guide

Microsoft Outlook 2002 - Default Port - Setup Guide

Microsoft Outlook 2002 Setup Details

Microsoft Outlook 2003 - Alternate Port - Setup Guide

Microsoft Outlook 2003 - Default Port - Setup Guide

Microsoft Outlook 2003 Setup Details

Microsoft Outlook 2007 - Alternate Port - Setup Guide

Microsoft Outlook 2007 - Default Port - Setup Guide

Microsoft Outlook 2007 Setup Details

Microsoft Outlook 2010 - Alternate Port - Setup Guide

Microsoft Outlook 2010 - Default Port - Setup Guide

Microsoft Outlook 2010 Setup Details

Microsoft Outlook 2011 for Apple Mac OS X - Alternate Port - Setup Guide

Microsoft Outlook 2011 for Apple Mac OS X - Default Port - Setup Guide

Microsoft Outlook 2011 for Apple Mac OS X Setup Details

Microsoft Outlook 2013 - Alternate Port - Setup Guide

Microsoft Outlook 2013 - Default Port - Setup Guide

Microsoft Outlook 2013 Setup Details

Microsoft Outlook 2016 - Alternate Port - Setup Guide

Microsoft Outlook 2016 - Default Port - Setup Guide

Microsoft Outlook 2016 Setup Details

Microsoft Outlook Express 6 - Alternate Port - Setup Guide

Microsoft Outlook Express 6 - Default Port - Setup Guide

Microsoft Outlook Express 6.x Setup Details

Microsoft Outlook.com & Hotmail.com Webmail

Microsoft Pocket Outlook - Setup Guide

Microsoft Vista Mail 6 - Alternate Port - Setup Guide

Microsoft Vista Mail 6 - Default Port - Setup Guide

Microsoft Vista Mail 6 - Setup Details

Microsoft Windows 10 Mail App

Microsoft Windows 8 Mail App

Microsoft Windows Live Mail 2009 - Alternate Port - Setup Guide

Microsoft Windows Live Mail 2009 - Default Port - Setup Guide

Microsoft Windows Live Mail 2009 Setup Details

Microsoft Windows Server 2008 and IIS 7 - SMTP Server - Setup Guide

Mountain Lion 10.8 - Mac Mail Setup Details

Mozilla Thunderbird 0.9 - Alternate Port - Setup Guide

Mozilla Thunderbird 0.9 - Default Port - Setup Guide

Mozilla Thunderbird 0.9 Setup Details

Mozilla Thunderbird 1 - Alternate Port - Setup Guide

Mozilla Thunderbird 1 - Default Port - Setup Guide

Mozilla Thunderbird 1 Setup Details

Mozilla Thunderbird 17 - Alternate Port - Setup Guide

Mozilla Thunderbird 17 - Default Port - Setup Guide

Mozilla Thunderbird 17 Setup

Mozilla Thunderbird 2 - Alternate Port - Setup Guide

Mozilla Thunderbird 2 - Default Port - Setup Guide

Mozilla Thunderbird 2 Setup

Mozilla Thunderbird 3 - Alternate Port - Setup Guide

Mozilla Thunderbird 3 - Default Port - Setup Guide

Mozilla Thunderbird 3 Setup

Mozilla Thunderbird v24 - Alternate Port - Setup Guide

Mozilla Thunderbird v24 - Default Port - Setup Guide

Mozilla Thunderbird v24 Setup

Mozilla Thunderbird v38 - Alternate Port - Setup Guide

Mozilla Thunderbird v38 - Default Port - Setup Guide

Mozilla Thunderbird v38 Setup

Netscape Mail 7 - Alternate Port - Setup Guide

Netscape Mail 7 - Default Port - Setup Guide

Netscape Mail 7.x. Setup Details

Opera 7.x Setup Details

Opera 8.x Setup Details

Opera 9.x, 10.x Setup Details

Opera Mail 7 - Alternate Port - Setup Guide

Opera Mail 7 - Default Port - Setup Guide

Opera Mail 8 - Alternate Port - Setup Guide

Opera Mail 8 - Default Port - Setup Guide

Opera Mail 9 and 10 - Alternate Port - Setup Guide

Opera Mail 9 and 10 - Default Port - Setup Guide

Outlook (v15.x) for Apple Mac OS X - Setup Guide

Outlook Express for Mac - Alternate Port - Setup Guide

Outlook Express for Mac - Default Port - Setup Guide

Outlook Express for Mac - Setup Details

PHP SMTP Authentication Troubleshooting Script

PHP and PEAR::Mail - Setup Guide

Postfix 2.x SMTP Mail Transfer Agent for Linux and Unix - Setup Guide

Qualcomm Eudora 6 for Mac - Alternate Port - Setup Guide

Qualcomm Eudora 6 for Mac - Default Port - Setup Guide

Qualcomm Eudora 7 for Windows - Change SMTP Port

Qualcomm Eudora 7 for Windows - Change SMTP Relay Persona

Sendmail 8.x SMTP Mail Transfer Agent for Linux and Unix - Setup Guide

The Bat - Alternate Port - Setup Guide

The Bat - Default Port - Setup Guide

The Bat Setup Details

University of Washington Pine 4 - Alternate Port - Setup Guide

University of Washington Pine 4 - Default Port - Setup Guide

University of Washington Pine 4.6 Setup Details

Frequently Asked Questions

SSL changes happening on the 3rd of October 2017

What is SMTP?

Do you add advertising to my emails?

What is the maximum size of message I can send?

Which email programs are not compatible?

Which email programs are compatible with AuthSMTP?

My ISP blocks SMTP on port 25 - what can I do?

What type of authentication should I use?

Can I change my username and password?

Can I use AuthSMTP to send bulk email?

How do I know which account I need?

Does AuthSMTP use POP-before-SMTP?

How can I pay?

My ISP proxies SMTP port 25 - is there an alternative port?

How do I renew my AuthSMTP service?

Can I upgrade my service and how much will it cost?

Do you offer a FREE or trial SMTP service?

My email gets caught as SPAM - can AuthSMTP help?

Why does it say "GetOnline" on my credit / bank statement?

Why should I not use personal SMTP server software?

What is the maximum number of recipients I can send to per message through your service?

Do you block any domains or email addresses?

Why do I need an email address to sign up?

Can I use AuthSMTP to send mail from multiple email addresses?

What do the SMTP error / reply codes mean?

How do the message number and size quotas work?

Can I use one AuthSMTP account on more than one computer?

How do I access the online AuthSMTP control panel?

I get a 'not authorized to send' error message?

Do I have to change my POP3 server or POP3 username / password?

How do you detect and stop SPAM / email abuse?

Where are your servers based?

Should I use the default or alternate SMTP port settings with the SMTP server?

Does AuthSMTP work with SMIME - S/MIME?

Do you offer a reseller package / discount or affiliate scheme for AuthSMTP?

Do you have any information to reduce the spam I receive?

Do you offer telephone support for your outgoing email service?

Do you virus scan my outgoing mail?

Can unused quota be carried over to the next month?

Can I limit the size of attachments that can be sent?

Do you support Apple Macs, MacBooks, iPhones, iPads, iPod Touch?

Can I authenticate to the SMTP server on the 'from' address only?

Can I authorise my whole domain name to send through your SMTP service?

Can I connect to the IP address of your SMTP relay server?

Do I get a POP3 mailbox with AuthSMTP?

How do I recover my username / password?

Why do the Microsoft Outlook 'Test Account Settings' Fail?

Why should I not just use webmail when mobile?

In the Control Panel - what is the 'admin' email address?

Will my IP address show in the email headers?

Can I authenticate based on my IP address only?

Do I have to change my email program?

Do you support SSL / TLS encrypted connections?

Can I take a copy (duplicate) of emails sent?

Do you keep a log of messages sent?

Do you offer shorter term or monthly billing accounts?

How many concurrent connections / threads can I use?

How can I avoid getting spam complaints?

Do you offer an anonymous SMTP service?

What is SPF (Sender Policy Framework)?

I get SSL errors when sending email?

I cannot login to the Control Panel...

Why is it best to send email as one message per recipient?

What happens if I exceed my quota?

Will my email address change - do I send from ???@authsmtp.com?

Is AuthSMTP a software program I install?

Do I need to make changes to my MX (mail exchange) records?

Can I send email from a form on my website?

Can you handle .uk.com and other domain types?

Why do you use PayPal for payments?

Can I have a dedicated / static IP address with my AuthSMTP account?

Can I download a raw log file of my message history?

Can I renew my AuthSMTP account early?

Will you auto-renew my AuthSMTP account when it is due for renewal?

What is an Email Address Re-write?

Do you offer DKIM signing and support?

In the Control Panel - what is the 'complaints' address?

Why do my messages grow in size when I send them via AuthSMTP?

What is Google Analytics and how can I use it to track my emails?

Can I send from an email address that does not exist?

Do you provide an API?

What SMTP ports can I use?

How do I setup AuthSMTP?

Can I use AuthSMTP for automatic email forwarding?

Does AuthSMTP support the SMTP pipelining extension?

Everything you need to know about complaints

Do you send DSN / NDR (delivery status notification / non-delivery report / bounce) emails?

How do I change the hostname and from address on my Amazon EC2 instance when using AuthSMTP?

How do I redirect DSN / NDR / Bounce emails to another email address?

How can I protect my website contact forms from abuse using a CAPTCHA?

Can other AuthSMTP users send from my domain name?

Knowledge Base

Search

SMTP Error Codes

Error 500 - Envelope from address is not authorised

Error 502 - Header from address is not authorised

Error 428 - Your account is using SSL

Error 429 - Your account has expired

Error 535 - Authentication Failed

Error 250 - Email contained a Virus and was discarded

Error 426 - You account is currently disabled

Error 452 - Too many recipients

Error 432 - Account is at / over data quota

Error 441 - Account is at / over data quota

Error 433 - Account is at / over message quota

Error 443 - Account is at / over message quota

Error 513 - Your email system must authenticate before sending mail

Error 454 - Your email system must authenticate before sending mail

Error 536 - ESMTP Message too large

Error 556 - Message too large

Error 434 - Your account has not yet been verified

Error 435 - Your account has not yet been verified

Error 440 - Your account has not yet been verified

Error 442 - Your account has not yet been verified