UniSender plugin allows you to create an attractive subscription form for people who come to your site, which will greatly increase a loyal customer base. With UniSender plugin you can quickly and easily change your subscription form and install it on your website or blog. Information about subscribers will be automatically saved and segmented in your account UniSender http://www.unisender.com
Amazon SES mailing list is mailing list based on Amazon Simple Email Services. With the cost of $0.10 per thousand emails the Amazon SES are one of the most cheapest ways to send bulk messages without troubles of managing mail servers.
A newsletter system for MODX Revolution.The cron file is web-accessible, means that it can be used for 3rd party cron service outside of the origin web host.The email templates use Resources, so they can be easily edited by non-techy manager users. This makes it easier to avoid messing up the HTML codes in the chunksThe documentation is in here http://rtfm.modx.com/display/ADDON/virtuNewsletter.https://github.com/virtudraft/virtuNewsletter
Notify sends email updates to users on your site and (optionally) posts to Twitter and Facebook. The users can be selected by User Group, and/or by tags specifying user interests. The updates are manual, rather than automatic, so Notify only sends them when you tell it to.
Eletters, formally GroupEletters, is a Addon for MODX Revolution that allows you to create & send beautiful email campaigns within MODX! You can now take advantage of MODX advanced template features to create custom eletter templates. Easily manage lists & subscribers and allow subscribers to manage their own preferences. Personalize your emails with some default placeholders.