fix mail template

[mkofahl]

Mail clients may hide the content if the table showing the logo is at 100% height.

[gary-kim]

Thank you for your contribution!

Could you add a DCO to your commit? The easiest way would be to add the -s flag from the command line. You can run the following command to add a DCO from the head of your commit: git commit -s --amend then git push --force-with-lease.
Otherwise, you can also add the following to the bottom of your commit message.

Signed-off-by: Random J Developer <random@developer.example.org>

[nickvergessen]

@mkofahl any specific client you had a problem with?

[mkofahl]

@mkofahl any specific client you had a problem with?

Yes, Zimbra.

[MorrisJobke]

@jancborchardt@skjnldsv Do you think this is okay CSS-wise?

[skjnldsv]

@mkofahl can you post before/after screenshotsplease, we usually like to have direct comparison on design pull requests!
Thanks for your work!! 🚀

[J0WI]

ping @mkofahl

[MorrisJobke]

Let's close it as we can reopen it at any time anyways.