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

Many ISPs are blocking the default SMTP port 25 to prevent spam - to resolve this issue we provide a number of alternative ports that you can use with our service.

Please see What SMTP ports can I use?

We also have a web based SMTP port checker tool which will test which ports are open from your computer to our network.

Are you having a problem sending email or looking for a reliable SMTP server?

AuthSMTP is the outgoing SMTP email service for your e-commerce website, mailing list or email program.

It works on most current computers or devices and solves many of the common problems with sending email such as relaying denied errors or blacklisting issues.

With instant setup, a money back guarantee and very low cost starter accounts you can test and start sending email in minutes with no risk.

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