I have the mxclassic free plan from years ago.
This morning I have received email from mailgun, that they decided to no longer offer free email.
I guess I will try the mxroute from years ago. The thing is, I don’t know what to put on my domain record. You know dkim, spf, and stuff. Where can I find it ?
p.s. I am pretty sure my welcome email is already deleted.
Check Email History menu entry from the portal, should be able to retrieve the Important Account Information email, I think … 
Looks like you’re on Galaxy.
MX records are:
Priority: 10
MX: galaxy.mxroute.com
SPF:
Type: TXT
Name: @ or blank, depending on DNS provider preference
Content: “v=spf1 include:mxroute.com -all”
DKIM not supported, you may be able to get it to work but I don’t have a workflow to share. These VestaCP servers have been mostly abandoned for years, and should be considered a moderate security risk. I’ve warned customers but they’ve chosen to stay on them at the risk, so I’m not going to close the accounts and force their hand.
Probably purged to lighten the DB