On 05/08/2023 03:57 AM, Dan Malm via mailop wrote: > On 5/6/23 17:28, H via mailop wrote: >> I am new to doing mass mailings to customers and leads - not spam - and am >> looking for some introduction how to interpret different types of rejection >> messages so we can improve our success rate etc. > > Many mailbox providers do at least some things "their own way" so there's no > catch-all one-stop for all messages and codes. But a good start for what the > different status codes (should) mean is > https://www.iana.org/assignments/smtp-enhanced-status-codes/smtp-enhanced-status-codes.xhtml Thank you. > >> SMTP error from remote server for RCPT TO command, host: >> xxx.mail.protection.outlook.com (104.47.51.202) reason: 550 5.7.1 Service >> unavailable, Client host [74.208.4.197] blocked using Customer Block list >> AS(1420) [AM7EUR03FT040.eop-EUR03.prod.protection.outlook.com >> 2023-05-05T06:31:14.035Z 08DB4D3079BE1687] > > That IP is in at least 15 blacklists: > https://multirbl.valli.org/lookup/74.208.4.197.html mxtoolbox. com only reports one, ZapBL. The link above did not list it on ZapBL but on 15 other lists, none that seems recognizable to me (for whatever that is worth). I could not find outlook, o365 or microsoft on that list though. It seems multirbl.valli.org is a better site to use for blacklisting checks than is mxtoolbox.com. > > As others have said: If you share your outbound IP with others you share your > IP reputation with others. So you will get penalized because your neighbors > are spammers. Self hosting is not necessarily the cure for this though as > (especially with the "too big to fail" crowd) there might instead be > _too_few_ mails coming from your IP to build a reputation which might impact > your deliverability to inbox. > Understood.
_______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
