How to set up DKIM when sending via modMail?

Question

MODX

Setting up a DKIM signature.
Mail works through Yandex Mail for Domain. I have achieved so far that the signature appeared when sending "by hand" from Yandex, but the letters that are sent by modx do not have a signature.
For sending I use modMail .
Can you tell me how to make DKIM still appear in letters sent via modMail?
Thanks to!

Answer 1

In Modx or in the add-on from which you are sending, configure SMTP Yandex.