I am getting a new 550 error when sending out an email that I send out every week The basic message doesn't change format but contains new text, images and links. I have started receiving the message "550 5.7.1 p27Kasbg014242 This message does not comply with required standards." for about half of my recipients in MaxBulk Mailer. If I send it again to the remainder which had errors the first time, again about half go thru. All my settings and even the recipients list is the same.
Any ideas here?
Any ideas here?