Hello,
We're experiencing mails not sending to recipients in version 9.2.17 when we're sending an e-mail that contains smartsearches. The status of the mail stays on 'sending...', see screenshots attached.
After we've send one of those, no other mails can be sent via the marketing center.
After an application pool recycle, all mails that did not send get the status of failed and then we can send normal mails again until we send an email with a smart search.
The error logs are included in the attachments.
With kind regards,
Justin Breg.