Most normal email programs (Outlook, Entourage etc.) will only use a single thread when sending email to our servers and for these no changes are required.
If you are using mailing list software to send a larger volume of email through our servers there may be a performance benefit by configuring your mailing list program to use multiple connections to our server.
When sending email to our servers various details (i.e. the recipients domain name etc.) have to be looked up / checked etc. which can cause minor delays. These delays are not noticeable for normal email programs - however, for mailing list software (trying to delivery a large volume of email quickly) they can add up.
To resolve this we allow a maximum of 5 concurrent connections per account (or per IP address) - so you can configure your mailing list software to use between 1 and (a maximum of) 5 threads / concurrent connections to our SMTP servers.
If you have any questions please contact us.
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