Proper IP address formatting in HELO/EHLO
Proper IP address formatting in HELO/EHLO

The last commit missed one thing: when sending a bare IP address
as part of HELO/EHLO, SMTP requires the address is surrounded by
square brackets.

emersion/geary,emersion/geary,jimbonator/geary,AtticHacker/geary,mjog/geary,glebihan/geary,MohamedIM/geary-unofficial,mpdeimos/geary,mjog/geary,rschroll/geary,aatishnn/geary,geekvigilante/geary,githubnemo/geary,tshikaboom/geary,martinra/geary,jimbonator/geary,kyoushuu/geary,abn/geary,githubnemo/geary,AtticHacker/geary,tshikaboom/geary,martinra/geary,tshikaboom/geary,rschroll/geary,glebihan/geary,robol/geary,robol/geary,aatishnn/geary,kpiwko/geary,kyoushuu/geary,glebihan/geary,martinra/geary,mjog/geary,robol/geary,githubnemo/geary,aatishnn/geary,AtticHacker/geary,emersion/geary,jimbonator/geary