Preventing our outgoing email from being blacklisted because of our ISP?

Post date: 2018-05-17 03:41:18

The outgoing email we are sending to a particular client is getting blocked by their IT department - their IT people shared a log showing the messages has not been delivered. The stated reason for the blockage is that the outgoing SMTP server used by our ISP (1&1 in our case) is being blacklisted by one of the filters used by our client. It seems to be this is a generic problem affecting all users of this particular SMTP server; 1&1 have been useless at responding to our requests they address the issue (their advice is to us to request that our client organisation whitelist their server - which the client IT people are reluctant to do).

Can people recommend a way for avoiding being blacklisted by this type of mechanism? Our outgoing email is modest volume and is targetted to named addresses rather than being bulk. We're happy to try configuring our own SMTP server - if that would be effective - or to pay for an alternative service which we would have a reasonable idea to be reliable. Suggestions welcome.

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