You may try ADN Email. They have a nice working email gateway service and restrictions are not that strict.Was using mailchimp but they banned me due to affiliate linkingNeed to find another provider who isn't as strict.
hey @SMMnet ,
Earlier I was Using Sendgrid, They Banned my Account without my permission.
So Lately, I Started using Pepipost. Till Date, I'm pretty much happy with Pepipost as all my Bulk Emails go to Inbox within Fraction of Seconds.
They have a great Co-operative Support team too. I would recommend you to try them.