# Cannot send emails to contacts or campaign

**URL:** <https://forum.mautic.org/t/cannot-send-emails-to-contacts-or-campaign/36115>\
**Category:** Mautic 6 Install/Upgrade Support\
**Created:** [July 17, 2025, 3:43am UTC](https://forum.mautic.org/t/cannot-send-emails-to-contacts-or-campaign/36115 "2025-07-17T03:43:16Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![mattewwade06](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/mattewwade06/32/14401_2.png) [@mattewwade06](https://forum.mautic.org/u/mattewwade06)\
**Post date:** [September 9, 2025, 10:30am UTC](https://forum.mautic.org/t/cannot-send-emails-to-contacts-or-campaign/36115/2 "2025-09-09T10:30:10Z")

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Thanks for sharing the error details! Since your SMTP test works but campaign emails still fail, it may be related to how Mautic handles cron jobs and pending sends. A similar case was discussed here: [https://forum.mautic.org/t/](https://forum.mautic.org/t/emails-sending-problem-not-sent-to-all-contacts/34267)[estate agents london](https://realestateagentslondon.co.uk)[/emails-sending-problem-not-sent-to-all-contacts/34267](https://forum.mautic.org/t/emails-sending-problem-not-sent-to-all-contacts/34267)

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