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I would like to take advantage of a third party service to send out emails, but I don't want to duplicate my user list. Is there a service that offers an API that will accept recipient emails rather than force me to pre-submit a list?

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up vote 2 down vote accepted

Almost all email apps have APIs

Check out these:

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+1 for SendGrid – Marc Roberts Jul 28 '10 at 9:26
Thank you, SendGrid is the type of service I am after (sending emails rather than managing lists). Any others offer this type of service? – Michael Teper Jul 29 '10 at 6:16
No problem Michael! – Jeff Epstein Jul 29 '10 at 12:43

I can heavily recommend PostmarkApp if you are sending transactional emails instead of newsletters / mail lists. It has a neat API and great support.

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Thank you! If I need to go over the free 200 mails/day from SendGrid, I'll give these guys a try. – Michael Teper Aug 4 '10 at 10:13

Try Email It - Email Marketing and List Manager. They have a really good email marketing API.

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I use MailChimp, they have a great upload, as well as a great API to allow you to push submissions to them as user want to subscribe.

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I can offer the software I develop. http://www.convincingmail.com

It is an email marketing solution instals on your server and allows you to send email marketing campaigns. No need to share your list double verify and etc...

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