Mail to Team Cannel - Remote Server returned '554 5.4.0'
Hi I have a strange effect with sending Mail to a Teams Channel. If send an external User user1@domain.com a mail to the Teams channel, the recive a NDR with the following text Remote Server returned '554 5.4.0 < #5.4.182 smtp;554 5.4.182 Problem occurred during the delivery. Exception Message:The remote server returned an error: (400) Bad Request.>' If an other external user from the same Company user2@domain.com send a Mail will delivered to the teams Channel.