Legitimate sent email being marked as spam and not sent
I have a problem sending emails to client with a pdf attachment. The original email contained both embedded links and pdf attachements, but I discoverd that sending the email without attachments worked. This has been a problem since 21:00 on 26/11/20 (now almost 18:00 on 27/11/20).
Similar emails have been sent without any problem for the last four weeks.
Error message reads:
The following recipient(s) cannot be reached:
Cxxxx Hxxxxx on 27/11/2020 17:32
552 5.7.0 SPAM Content Found (VM603) ihbLk5udCJ4GLihbQkCHId
Re: Legitimate sent email being marked as spam and not sent
Thaks for suggestion. Webmail was sent to spam folder. No links in the pdf - text only. Other similar pdfs are sending OK. Have tried recreating the pdf but still no good. Any idea what next steps are?