I'm having trouble figuring out an issue we've been having. To start, I configured MailEnable to redirect all mail to our Spam appliance so it could handle inbound and outbound. I have a couple of users who redirect mail to a Gmail account. Some emails won't actually deliver and I receive a MDF instead. Here's an example:
Code: Select all
Recipient: [SMTP:user1@gmail.com]
Reason: 550-5.7.1 [Our Public IP 12] Our system has detected that this message is likely unsolicited mail. To reduce the amount of spam sent to Gmail, this message has been blocked. Please visit https://support.google.com/mail/?p=UnsolicitedMessageError for more information. u19-20020a056e02111300b002d0f9f4e4bcsi1522857ilk.150 - gsmtp
I assume that with multiple users doing this is why Gmail suspects it as bulk. I disabled the smart host, yet the same issue persists. I've tried following their bulk email guidelines and now I'm also receiving a hard SPF fail check sometimes and an unsolicited email message:
Code: Select all
Recipient: [SMTP:user1@gmail.com] This message fails to pass SPF checks for an SPF record with a hard fail policy (-all). To best protect our users from spam and phishing, the message has been blocked. Please visit https://support.google.com/mail/answer/81126#authentication for more information. v3-20020a05620a0f0300b006a64dbdb75asi1022063qkl.308 - gsmtp
I've checked our SPF records with a number of tools online and they pass with our domain and IP using ~all. However, this seems to contradict what the above SMTP error message says. I'm not exactly sure what I should do here?