Add config for tum.de (#363)

share/domains.csv

@@ -252,6 +252,7 @@ tlu.edu,imap-mail.outlook.com,993,smtp-mail.outlook.com,587
 tquad.ai,imap.mail.eu-west-1.awsapps.com,993,smtp.mail.eu-west-1.awsapps.com,465
 tu-harburg.de,mail.tu-harburg.de,993,mail.tu-harburg.de,587
 tuhh.de,mail.tu-harburg.de,993,mail.tu-harburg.de,587
+tum.de,xmail.mwn.de,993,postout.lrz.de,587
 txstate.edu,outlook.office365.com,993,smtp.office365.com,587
 ua.pt,outlook.office365.com,993,mail.ua.pt,25
 uach.mx,imap.gmail.com,993,smtp.gmail.com,587