commit 26e754

2026-04-30 12:11:46 theophile: greylisting delay in troubleshooting section

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`services hng/mailu.md` ..
@@ 28,3 28,11 @@
	```bash
	docker compose exec admin flask mailu user myuser example.net 'password123'
	```
+
+	## Troubleshooting
+
+	### Emails sent are takinga while or just not arriving
+
+	MailU implements greylisting: this means that it will reject emails from first-time senders, and ask to resend later. This can then take a while.
+
+	For email validation systems, just resend a code immediatly, to get the email.