On 05/06/2023 03:24 PM, Atro Tossavainen via mailop wrote: >> We are mailing from our own CRM system but using Ionos (1and1.com) as our >> mail service. > You're setting yourselves up to fail by mailing out of a server shared > by thousands of other customers. The error messages you quote testify > to that. Don't do it. > Understood. We plan to change the setup over the summer but until then we have to work with what we have. When we change we will probably set up our own postfix server for mail handling. I should have added that our future "mass mailings" would be around 1000 emails per week or every two weeks, iow, not too much.
I did check the Ionos sending IP address on a couple of websites, including mxtoolbox.com, and it is not listed. _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
