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Now I’m working on EasyMail v.2, my newsletter plugin for WordPress.
Here you are the structural changes about which we talked some months ago.

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I think to have found a structural issue that could be a cause of several problems (eg. multiple messages to same recipient, no progress on sending, staying at 0%), first of all when sending to a large number of recipients. And I’ll fix it in version 2 that I hope to release soon…
I will have to rewrite the generation of recipients’ list. For now, the entire list is an array serialized in a single field of database. (Remember that at the beginning the plugin was designed for small blogs…) If the list is quite large (80? 100? 200?… it depends on server capacity of course) the system could have timeout and efficiency problems to do all required operations: open (unserialize) the entire list, extract the single recipient (name, language, email) to send to, send newsletter, update the “already sent” attribute, repeat for every recipient of the the batch, finally save (serialize) the entire list. I think the multiple mails to a same recipient could be caused by an error during updating the “already sent” recipient attribute and/or saving the list.
In next version, each recipient info will be stored in a single row of a database table. So, each operation is made only on a very short amount of data.
I think that this update can solve a lot of problem. Please share and post your remarks in the forum.

UPDATE: for now a hack that seems to work is to modify the cron timeout from 0.01 to 20 seconds (read how). There you can read about other tips maybe could help you. Please let us know about your tests and feedbacks.

When I have more time, I’ll work hard on EasyMail next release. I have some good ideas for new features and, of course, a lot of good ideas are coming from all plugin users. Many thanks.
In the meantime, today I have uploaded some new translation files (thanks to all translators!).
The download page is always wordpress.org/extend/plugins/alo-easymail.

Sorry, I’m very busy, but in a very few days I’ll release it.
Be patient…

NEW FEATURES

• mailing lists
• subscription choice on registration form
• tracking system when subscribers open newsletter
• subscribers importation from existing members or from a csv file
• use capabilities and not user_level, so better permission managing

MINOR CHANGES

• Added: an option to show subscription page
• Added: dashboard widget and favorite menu link
• Updated: a better formatting in admin side
• Fixed: now admin can modify subscription on user profile page
• Fixed: now easymail page and its option are properly deleted on deactivation
• Fixed: encode entities in newsletter header and subject
• Fixed: removed a lot of php warnings and wp notice

Today I’ve tested EasyMail v.1.7 on WP 3.0 RC3 and the test has gone well. The WP cron seems to continue working well.

In these days I’m working on next EasyMail version. I hope to release it soon (it depends on time left over my work commitments….).