My boss pointed out that, with my new email provider, GMail is displaying a weird message in the “from” field:

Turns out I needed to add two custom TXT-type DNS records in Dreamhost. One is SPF and the other is DKIM. These custom records will get rid of ”via messaging engine.com.”

Email, DNS, and the whole “system administration” thing is really not my thing. I’m an iOS guy, so I don’t really like to fuck around with servers. But I managed to figure it out: