Hello Zhang,
Do all emails have this issue this time?
Yes. All sent emails.
Do all mail client applications view this email with same display (no subject, sender, just mail body (with full headers as part of mail body)?)
I have tried several mail clients aftermail, thunderbird with no luck....but when tried to send to another mail server (iRedMail installation as well) the roundcube displays the email correctly. Gmail rejects the messages saying
" Our system has detected that this message
is 550-5.7.1 not RFC 5322 compliant. To reduce the amount of spam sent to
Gmail, 550-5.7.1 this message has been blocked. Please review 550 5.7.1
RFC 5322 specifications for more information. r124si6130847wmd.119 - gsmtp
(in reply to end of DATA command)"
Could you please try steps below as a testing:
*) Comment out "content_filter =" line in /etc/postfix/main.cf and /etc/postfix/master.cf.
*) Restart Postfix service.
*) Try to send several testing emails with multiple mail client applications, including Thunderbird, Roundcube webmail, etc.
After I did this I am receiving totally blank emails, no from , subject, nothing in body (I can see the mail contents only if I click view source/view original). Seems like amavisd is not working as expected.
Thanks/