Is anyone else with v3 installed able to duplicate this?

Confirmed still an issue with Version 3.1.0+180124 .

Is anyone else able to reproduce this issue?

Can you attach the related survey as .lss file with which you can reproduce this?

LSS attached!

After investigating deeply into this the reason that the second email looks different than the first one is that the encoding of the email changes because the linebreaks change after first post because of using a Windows browser.

The email format is still valid though, just encoded a bit differently. In my email client the 2nd email looks perfectly fine - I can only see the difference in the source of the email.

I therefore assume that it is actually some issue with your email reader.
Can you try in a different reader?

Note: I tested with 3.3.1

Thank you for your time.

I just did another test using 3.2.0+180206 .
I sent invites to three destinations:
Exchange 2010+update19 + Outlook 2016
same messages access from outlook webmail

Linux Server running qmail (where LS is installed) and viewed on Thunderbird (windows)

Gmail web client

1. The problem was only visible on the exchange server. It was visible on both the web client and Outlook, so that takes the client out of the picture. I believe this indicates an email formatting issue that the exchange server does not like.

2. When we sent out surveys, I received feedback from a certain percentage that the email they received was corrupted (as described). So this confirms the issue is with more than just the exchange server where I am able to test.

Where do we go from here? Can the difference between the emails not be corrected?

Did you verify if the feedback is coming from recipients without Exchange?

Take a look at this discussion:
https://github.com/PHPMailer/PHPMailer/issues/606

@jelo: That is an excellent hint - thank you!
@snowsam: I have updated the PHPMailer library now and it will be included in next release. Please test again once we released.
if it still does not work after that please feel free to reopen this issue.

Thank you both!

-Sam

Version 3.4.1. released