Nagios Support Forum

Hello ,

We are using office 365 as our mail server. Post fix is configured to relay emails to office 365 server.I have whitelisted post fix Ip in office 365 admin panel .Still messages are not received to the support mailbox.We are facing this issue since we have migrated our email to office 365 services.We have also added this ip in SPF record.

Please find the bounced message
SMTP<< 220 MA1IND01FT008.mail.protection.outlook.com Microsoft ESMTP MAIL Service ready at Wed, 1 Aug 2018 13:19:53 +0000
SMTP>> EHLO mon02.xxxxxxx.com
SMTP<< 250-MA1IND01FT008.mail.protection.outlook.com Hello [XXX.XXX.XXX.XXX]
250-SIZE 157286400
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-STARTTLS
250-8BITMIME
250-BINARYMIME
250-CHUNKING
250 SMTPUTF8
SMTP>> STARTTLS
SMTP<< 220 2.0.0 SMTP server ready
SMTP>> EHLO mon02.xxxxxxx.com
SMTP<< 250-MA1IND01FT008.mail.protection.outlook.com Hello [XXX.XXX.XXX.XXX]
250-SIZE 157286400
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-8BITMIME
250-BINARYMIME
250-CHUNKING
250 SMTPUTF8
SMTP>> MAIL FROM:<> SIZE=48319
SMTP>> RCPT TO:<[email protected]>
SMTP>> DATA
SMTP<< 250 2.1.0 Sender OK
SMTP<< 550 5.7.511 Access denied, banned sender[XXX.XXX.XXX.XXX]. To request removal from this list please forward this message to [email protected]. For more information please go to http://go.microsoft.com/fwlink/?LinkId=526653. AS(508) [MA1IND01FT008.eop-IND01.prod.protection.outlook.com]
SMTP<< 503 5.5.2 Need rcpt command [MA1IND01FT008.eop-IND01.prod.protection.outlook.com]
SMTP>> QUIT
SMTP(close)>>


Please help me.

jchan wrote:

Code: Select all

SMTP<< 550 5.7.511 Access denied, banned sender[XXX.XXX.XXX.XXX]. To request removal from this list please forward this message to [email protected]. For more information please go to http://go.microsoft.com/fwlink/?LinkId=526653. AS(508) [MA1IND01FT008.eop-IND01.prod.protection.outlook.com]

The line above means that the Office 365 server has banned your servers IP address.

You would need to talk to the Office 365 people to get it un-banned.