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I had an issue with rss2email r2e run hanging, causing my mbsync loop for mutt to not run (r2e run happens before mbsync in my infinite loop script). The debug output processed all of my feeds, and then hung at sending email.
When I tried to send email manually from the shell using sendmail <address>, I got the error message "Permission denied" trying to write to postdrop/<mail.file>. When looking at /var/spool/postfix/postdrop, it is writable but not readable by the postdrop group. I ran the following command to fix it:
sudo usermod -aG postdrop <my_user>Then I logged out of X.org, killed all my tmux windows, and logged out. Upon logging back in, r2e run ran successfully, and I had fixed the problem.
I'm not sure if this was documented, there may have been a notice when I upgraded postfix on June 10 that I totally missed.
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