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Most cloud providers block ports 25, 465, and 587. Port 2525 is commonly open but SendGrid only allows unencrypted messages via that port. Note: There are also so some certificate issues (see https://support.sendgrid.com/hc/en-us/articles/200182008-Certificate-verification-failed-for-smtp-sendgrid-net) See More
Usually when choosing a service to send your application's emails you need two. One to send the newsletter or news and promotions from the marketing team and the other to send you application's automatic emails and messages. With SendGrid you don't have to choose two because it doubles both as a transactional and marketing platform at once. See More
Since SES has been stripped down to do only one thing and do it well (send emails), there will be a lot of things missing which you will have to add on your own if you wish to have them. Things like analytics, template hosting, design tools etc... are missing from SES. Although there are third-party tools that allow you to use Amazon SES's API to send emails with all the above features added. See More
SparkPost delivers more messages to the inbox than any other provider, not just to the recipient, to the actual inbox. So while almost every company will claim high 90's on deliverability, Sparkpost is the only one that's been able to demonstrate high 90's on inbox placement as well. This has real revenue impact. See More
Free plan that allows for you to send up to 25,000 emails each month, with no credit card required. DKIM is not required (Domain Verification: (a.) Meta Tag Validation, (b.) File Creation - System can verify the domain based on the presence of a file in the root directory of the domain.). You pay only for emails that are not opened by your customers. See More
While other services make you pay for each email sent, Pepipost's philosophy is that email conversations should be free regardless, this way the pricing model is built around paying for emails that are not open. So it's up to you to make quality emails and make as much users as possible to open them in order to pay less. See More
Postmark offers very detailed analytics for your emails. For starters, it stores 45 days worth of email logs where you can search to find out which emails were sent, received, who received them, who read them and who marked them as spam. There are also recipient profiles which keep track of everyone who gets your emails, complete with a list of messages that they have opened, deleted or marked as spam. See More