For what it’s worth Don, you are not alone in your problem, although mine is an Australian ISP.

Many of my messages to and from my own group are delayed exactly 2 hours, they are held up at a sub server which checks for spam (I’ve checked this on the header analysis site, always held up at the same place). Something in the headers triggers this Spam alert, yet another email sent almost immediately afterwards will get through immediately.

On other occasions messages I have sent do not get delivered EVER, although they show as Sent in both my mail program (Outlook 2016) and on my webmail, which is set to IMAP… and very strangely, when I resend the exact same email (I have just clicked on Forward on it in the Sent Box) usually goes through without a hitch 24 hours later.

I have been battling with my ISP for over 5 months, they say there is nothing wrong at their end. At their request I changed from Windows Live Mail to Outlook 2016, this did not make a scrap of difference.

This past 10 days, I was a little smarter and pasted every delayed mail header in to Word. I also put in ?screen captures of where the “disappeared” emails shows as Sent in my IMAP webmail. Each of those show a strange blue curving arrow beside it, it is only beside the “disappeared” emails.? When I was speaking AGAIN to the ISP’s tech support, I sent those docs to the person? at the other end of the phone. She agreed that it “shouldn’t be happening” and has opened up what she called an ETS… meaning she sent my problem with the documents to a different internal section which checks the servers.. “passing it up the line”. I don’t know how long this will take for them to check it out and hopefully resolve the problem.

Maybe it is something in your mail program (although mine has been checked many times), but it is more than likely something similar to a spam checking server problem.

Stick with it, get in touch with the ISP… supply documentation if possible… and do not let them fob you off… if you can prove that it is held up at the same place, they will HAVE to check it out, but don’t hold your breath while waiting… lol.

One thing I noted, I don’t know if this applies to you… pretty well every disappeared email had an attachment of a graphic, but they are not large files, the biggest would have been less than 400 KB. The delayed emails mostly have a very small jpg inserted in to the body of the email… every email is HTML..

I hope this may give you a direction to consider… and I wish you good luck in resolving your problem.

In desperation, I have told them that if they can’t fix the problem, I will pass it on to the Telecommunication Ombudsman

Win

?