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If you are referring to Membership end date than probably you could use Fuzion tokens extension, it should give you membership end date token, which you can insert in mailing label
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JMA had two loosely related clients that were on the same server. See gist https://gist.github.com/JoeMurray/0d8663e9f034c0b5e23b123e75c9fa07 for the diff created about a year ago of the changes made to support this. I've obfuscated the client names but hopefully not mangled anything else. We didn't publish since this was a one-off, but maybe this will give ...
2
Something like via Adv Search
create Group A based on eg CiviMailing > Delivery Status = Successful
create Group B based on eg CiviMailing > Trackable opens = Opened
by my reckoning this should mean you can then find everyone who has had a deliver and exclude everyone in that group who has ever opened
use Custom Search Include/Exclude to say "...
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I don't know if it is just a coincidence, but after I upgraded the version of php my site uses from 7.3.33 to 7.4.27 I am again able to add images to a draft email.
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It's hard to imagine how the hash could be corrupted in transit, but easier to imagine how it could be overwritten in the database. I recommend enabling advanced logging (Administer menu » System Settings » Misc) so that you can see the old values of records in log_civicrm_mailing_event_queue.
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