My 2nd domain email is hosted on zoho. I have created my username @ my2nddomain.net.in email ID on zoho after going through the domain verification and MX pointing procedure.

I have successfully setup 'send mail as' to use my 1st domains smtp server( non zoho) details. All mails sent from web interface of zoho, show mails going out from my 1st domain.

I have activated active sync for zoho and setup my iOS device with zoho settings and username of 2nd domain email that is hosted on zoho.

When I send mails from my iOS device, I want the mails to go through the external smtp ( 1st domain), which is setup as "send mail as". However this is not happening. Do I need to change any further settings or this won't be possible at all.

Sorry if I have not made my issue clear.