@Smarty: Hm, potem sem pa nekaj zeznil.
Lahko pogledaš prosim te nastavitve:

1) Namecheap DNS je nastavljen na HostGator
2) Addon domena je narejena in deluje OK
3) Možno, da so tu problemi (HostGator MX Entry). Ker sem kupil Namecheap Private Email sem sledil tem nastavitvam:
https://www.namecheap.com/support/knowledgebase/article.aspx/1340/93/open-xchange-records-for-domains-with-third-party-dns
in
https://www.namecheap.com/support/knowledgebase/article.aspx/1339/
Kot kaže, Private Emaila sploh ne potrebujem in bi moral dodati samo nov email naslov v HostGatorju in to je to. Sedaj ga sicer tudi lahko dodam in celo pošljem mail iz njega, če pa želim odgovoriti na prejet mail, pa dobim odgovor o zavrnitvi:
Delivery to the following recipient failed permanently:
newsletter@------.com
Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the server for the recipient domain ---------.com by mx2.privateemail.com. [xxx.xxx.xx.xxx].
The error that the other server returned was:
550 5.1.1 newsletter@--------.com: Recipient address rejected: User unknown in virtual mailbox table
Naj poskusim pobrisati nastavitve za privateemail.com v MX records? Verjetno bi to pomagalo.
@jazzfunk: forwardiranje mi je prišlo na misel, vendar bom raje ostal pri ločenih mailih. :)