Postfix keeps creating mail in queue to send to sender's mail address after SMTP integration

unclesamcrazy · 07-17-2019, 01:00 AM

I have configured Postfix to send mail by added SMTP credentials. It is sending mail successfully. The issue is it keeps adding a mail in queue and it is getting bounced everytime. The 'from address' and 'to address' is same which is my SMTP login email id, the email from which I want to send emails.

This is the log entry which is continuously getting added in mail.log without skipping one second.

Code:

Jul 17 05:31:57 ip-10-0-100-86 postfix/smtp[23014]: 5D8F96507F: to=<username@mydomain.com>, relay=smtp.server.net[58.48.xx.xx]:587, delay=1.3, delays=0/0/1/0.25, dsn=5.7.60, status=bounced (host smtp.server.net[58.48.xx.xx] said: 550 5.7.60 SMTP; Client does not have permissions to send as this sender (in reply to end of DATA command))
Jul 17 05:31:57 ip-10-0-100-86 postfix/cleanup[23015]: AC0C6650CD: message-id=<20190717053157.AC0C6650CD@ip-172-31-38-186.ec2.internal>
Jul 17 05:31:57 ip-10-0-100-86 postfix/qmgr[15923]: AC0C6650CD: from=<username@mydomain.com>, size=2926, nrcpt=1 (queue active)
Jul 17 05:31:57 ip-10-0-100-86 postfix/bounce[23016]: 5D8F96507F: sender non-delivery notification: AC0C6650CD
Jul 17 05:31:57 ip-10-0-100-86 postfix/qmgr[15923]: 5D8F96507F: removed
Jul 17 05:31:57 ip-10-0-100-86 postfix/smtp[23014]: warning: smtp.server.net[58.48.xx.xx]:587 offered no supported AUTH mechanisms: 'GSSAPI NTLM'

username@mydomain.com is the smtp login email address and I send mails using same email address.
I am worried if there will be 55-60 mails will be bounced in a minute, my SMTP will be blocked. Please help to fix this issue.

GabrelW · 07-18-2019, 06:53 AM

Which Postfix version are you using?

scasey · 07-18-2019, 09:02 AM

Um. If the email is "getting bounced everytime" then it's not "sending mail successfully."

My guess is that you've not setup the authentication for your relay server correctly.

unclesamcrazy · 07-19-2019, 04:50 AM

Quote:

Originally Posted by scasey

Um. If the email is "getting bounced everytime" then it's not "sending mail successfully."

My guess is that you've not setup the authentication for your relay server correctly.

Thank You for your reply.
The mails are working, at least up to now. I can send mails using command line(mail command) and web application.
The issue is without doing anything, it is creating entry in log continuously. Whenever I run `mailq`, there is one entry in log in which 'from' and 'to' address is same. Every second the 6 lines error (mentioned in original post) is getting added in log. In every minute almost 55 mails are added as Bounced in log.

I have stopped Postfix server as this issue is not solved. Here are my added lines in main.cf.

Code:

relayhost = [smtp.server.net]:587
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_sasl_security_options = 
smtp_tls_CAfile = /etc/postfix/cacert.pem
smtp_use_tls = yes
smtp_sasl_mechanism_filter = login

canonical_maps = regexp:/etc/postfix/canonical
canonical_classes = envelope_sender

This is my /etc/postfix/sasl_passwd

Code:

[smtp.server.net]:587 username@mydomain.com:complexpassword

This is /etc/postfix/canonical

Code:

// username@mydomain.com

Apart from these, I haven't changed a character in Postfix files. Rest all are default settings.

If I do not add this line

Code:

smtp_sasl_mechanism_filter = login

I get error

Code:

SASL authentication failed; cannot authenticate to server smtp.server.net[58.48.xx.xx]: generic failure

If you suggest anything, it will be great help.

Thank you