On Sat, May 18, 2013 at 11:24:27AM -0700, Umar Draz wrote:
> We have created a Frontend software for sending emails, we want to send
> emails in bulk.
> From that frontend software we will just pass
> from address: e.g., [hidden email] > and smtp server: which is definitely our server
> and to address: (a loop of address around 500,000)
> Now we want above 500,000 emails should deliver through 4 SMTP relays
> through our Postfix email server.
> the from address will be [hidden email]
Who operates the SMTP relays? From your earlier description these
4 four relays have username + password login access, which sounds
like mail submission services for end-users operated by ISPs, not
bulk mail delivery services for businesses.
It would be unwise to try to deliver 500,000 email messages through
4 user accounts intended for people typing a few email messages a
day sent to one correspondent or a group of friends.
Postmark is for transactional email only. You may not send
newsletters, announcements to your lists or any other bulk email. If
you're uncertain if your email qualifies as 'transactional', you can
always contact support and we'll review your usage.
Similar considerations may apply to the others. If you're sending 500,000
messages at once, that does not sound "transactional" to me.
> Now my question is, is this possible? if yes then how?
You can use a different sender address to direct individual messages
to each of the 4 providers via sender dependent relayhost settings.
No promises this will work for very long, as most likely your mail