Basic question about file permissions for sieve error log

[J Doe]

Hello,

I have an admittedly very basic question, but I am not able to get it to work.

I store my global sieve script in: /etc/dovecot.  I recently made a mistake in my global sieve script which causes Dovecot to attempt to log the errors in: /etc/dovecot/sieve-global.log

In /var/log/dovecot.log I see:

Jul 24 15:33:32 lmtp(test at example.com): Error: ABVWGAx/V1uKLAAA1B5X9w: sieve: failed to open logfile (LOGGING TO STDERR): open(/etc/dovecot/sieve-global.log) failed: Permission denied (euid=5000(vmail) egid=5000(vmail) missing +w perm: /etc/dovecot, we're not in group 122(dovecot), dir owned by 0:122 mode=0775)

…but the group membership shows:

$ sudo -u vmail groups
vmail dovecot

…and I restarted Dovecot, but the same error happens.

What am I doing wrong ?

Thanks,

- J