The list of services, we considered are (not in any order) :
- Amazon Simple email Service
- SendGrid
- Postmark
- Dyn
- SocketLabs
- MailJet
- CritSend
- ElasticEmail
Few of the criteria I considered are: support for bulk email, cost effective, good API support, developer friendly, support to track email status
- Best cost effective solution - much ahead of others esp. when the load is very big.
- promised to be highly scalable
- available only in the beta stage
- poor documentation and not very simple when compared to sendgrid / postmark
- daily send limit of 10K mails only. This quota will be increased based on reputation.
SendGrid :
- very simple and easy to setup
- wide collection of plugins and availability of informative documentations
- not much budget friendly in the starter editions
- Daily quota of 7K emails in Lite edition. will increase by reputation.
- found few people reporting about delays in the mail delivery
Postmark :
- very simple and developer friendly similar to SendGrid
- however little costlier than SendGrid
Other useful links: