I can confirm iOS 18.2.1 has no included IMAP IDLE fix. To verify this 
assertion I did:
1. quit iOS Mail app AND shutdown my iPhone.
2. updated and commented out the imap_capability flag on my dovecot server: 
conf.d/20-imap.conf (commenting it out means the defaults (including IDLE) will 
be supported).

# Override the IMAP CAPABILITY response. If the value begins with '+',
# add the given capabilities on top of the defaults (e.g. +XFOO XBAR).
#imap_capability =IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE STARTTLS 
XAPPLEPUSHSERVICE ...

3. reloaded dovecot
sudo doveadm reload

4. powered up iPhone and launch Mail app.
I observed NO emails would appear.....NONE....

To verify this is the culprit, I reversed the steps above and immediately could 
see my Inbox populated.
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