TOC rewritten URLs issue with office 365 when URLs added in email subject due to Subject length limit on Office 365
TOC rewritten URLs are creating the issue while opening with office 365 when URLs are added in the subject due to the Subject length limit configured on Office 365. There is no way to modify the limit on Office 365. So If there is any possibility to reduce the length of the encoded URLs at our end in future will help to resolve this issue.
There is an email subject length limit of 255 characters on office 365 end.