Mandrill communication problem

[Prank]

I'm a bit bummed by the technical 'support' I received about this problem and it appears I need to wait a fair while between support replies so I'm begging you all for some help with this issue as I really need to get a bulk mail out.

Ultimately, notifications and bulk emails to small numbers of people (< 10) work fine.

My usual monthly mailout to 50,000 people is now (for the first time) complaining about a Mandrill communication error. 

System Error
There was an error communicating with Mandrill. Please contact technical support for assistance.

When I did into the logs in Mandrill I see a populated 'to' key in the response to the small send outs and an empty 'to' key with the big mail outs.

Eg (note the snip, there are more...);

"to": [ { "email": "cbiggins@[removed]", "name": "PranK" }, *snip*

while the bigger mail out has;

"to": {},

That makes me thing that IPB is not sending the addresses correctly to Mandrill. 

We have done 6 other mail outs this size this year, so we're not doing anything new.

Thanks in advance! We're getting desperate!

Christian

[Prank]

For anybody that finds this via search, my issue was escalated to tier 2 support who provided me with a patched mandrill.php file which utf8 encoded the usernames being sent to Mandrill, after applying that and restarting PHP-FPM it worked again.

[abetts]

Would you be kind enough to upload the patched mandrill.php file? I'm struggling since upgrading too. Thanks

[Prank]

Yep. 

Goes in admin/applications/members/modules_admin/bulkmail.php

 

bulkmail.php

[Lindy]

It should be noted this for IP.Board (3.4) - not IPS4. 

[Prank]

 

Just now, Lindy said:

It should be noted this for IP.Board (3.4) - not IPS4. 

Correct! Forgot to mention that. Thanks!

[abetts]

OK, thanks Lindy. I've submitted a support ticket regarding this for IPS4.