A customer recently switched from using POP3 email to Office 365, and is having issues with emails that are sent to their Office 365 account from their website.
We haven't had any complaints about this kind of issue before. The library (Swift Mailer) is well known and mature, and as far as we know we are only seeing the issue with emails sent to O365.
The emails are HTML (with a text version) and have an embedded header, but when we view them using O365 we see ...
* A plain text email
* The image header as an attachment
* Another attachment called ATT0001.HTM
Has anyone seen this issue before? I spent half a day with Google looking for other people with the problem, and there were a few ideas out there to try but none of them helped.
The website sits on a LAMP platform - not sure whether this will help to pin the problem down.
