when I am using mailing I am getting this error.

Question

A database error occurred.

Comments

need to info to understand problem.

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some mails are sending to users then after about 50 emails sent its shows "A database error occurred." then again I have to click on mailing then resume. this is happening again and again

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What do the server logs say?

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@pupi1985 When I disabled "asking questions : registered users with enough points " it solved the problem automatically. I have sent mail to about 426 users without error.

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it happened again when I try to send mailing from mobile device.... where to check log?

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check log in /var/log/httpd or /var/log/apache