Clearly this list is for postfix related issues which I do use regularly but there is a great deal of respected expertise here and am hoping someone will have come across this before.
I¹ve run into an issue with a postfix server I set up for a friend when connecting to Gmail. The message returned contains the following headers but has varied until finally just this: <azgoldsavi...@gmail.com> <mailto:azgoldsavi...@gmail.com>: host gmail-smtp-in.l.google.com[2607:f8b0:400e:c01::1a] said: 550-5.7.1 [2605:d400:0:b:216:3eff:fe63:ca2f 12] Our system has detected 550-5.7.1 that this message is likely unsolicited mail. To reduce the amount of 550-5.7.1 spam sent to Gmail, this message has been blocked. Please visit 550-5.7.1 http://support.google.com/mail/bin/answer.py?hl=en&answer=188131 for 550 5.7.1 more information. sf3si14947663pac.452 - gsmtp (in reply to end of DATA command) >From using some of the generic tools out there that test your mail server, the configuration I have seems to be working correctly. The messages are not unsolicited spam. He has a service that people sign up for and then he communicates the sales options. I have moved his server to different IPs. That worked for only a few messages then back to these headers. The SPF is as follows: ;; ANSWER SECTION: saguarogold.net. 38400 IN TXT "v=spf1 ip4:65.39.69.253 ?all² rDNS - ;; ANSWER SECTION: 253.69.39.65.in-addr.arpa. 86400 IN PTR mail.saguarogold.net. Postfix also answers for another domain on the same server but next IP. ;; ANSWER SECTION: goldsavings.com. 38400 IN TXT "v=spf1 ip4:65.39.69.254 ?all" rDNS - ;; ANSWER SECTION: 254.69.39.65.in-addr.arpa. 86400 IN PTR mail.goldsavings.com. Both domains have the same issue with Gmail. Reading on their site, they talk about DKIM and DMARC. Is anyone using these and are they effective for this issue? Suggestions? Has anyone else successfully combatted these issues with gmail? I have filled out the gmail form to report the issue several times with no changes. Thanks Steffan
