Issue milter-reject: DATA from / Mails from instagram

[bb74]

Hi Guys,

last night i wanted to create an instagram account and was waiting for a security code. But I didn´t get this code.
These are the logfiles:

Oct 7 02:09:33 gondor postfix/smtpd[27246]: 1D8CC1CA0A7F: milter-reject: DATA from 66-220-155-151.mail-mail.facebook.com[66.220.155.151]: 550 5.7.1 Command rejected; from=<security@mail.instagram.com> to=<xxx@xxx.de> proto=ESMTP helo=<66-220-155-151.mail-mail.facebook.com>

Why are the mails rejected? have no other mail problems. Any ideas?

 

[mow]

Rejections happen when you use greylisting. Do you?
It does avoid a lot of spam, but at the cost of a delay because the mail is only accepted on a retry a certain time later, and it will crit fail on domains where the retries come from another than the original IP.

 

[bb74]

After stopping greylisting the mails from instagram work. Very strange...