I am having a problem with multiple hosts being marked as down, with more coming approximately once a week.
It is very annoying for my users and reflects badly upon me, as an admin and advocate for us needing this product.
What will happen is:
1. Sent mails will stay in the queue and not get sent. If I don't do anything, users will get a mail after 3 days with message too old.
Looking in the ESA I see the hosts as down. (screenshot 1)
Cli tells me this:
hoststatus tinsillo.com
Host mail status for: 'tinsillo.com'
Status as of: Mon Mar 30 10:43:06 2020 -02
Host up/down: down
Counters:
Queue
Soft Bounced Events 0
Completion
Completed Recipients 0
Hard Bounced Recipients 0
DNS Hard Bounces 0
5XX Hard Bounces 0
Filter Hard Bounces 0
Expired Hard Bounces 0
Other Hard Bounces 0
Delivered Recipients 0
Deleted Recipients 0
Gauges:
Queue
Active Recipients 1
Unattempted Recipients 1
Attempted Recipients 0
Connections
Current Outbound Connections 0
Pending Outbound Connections 0
Oldest Message 10 hours 42 mins 53 secs
Last Activity Mon Mar 30 10:21:36 2020 -02
Ordered IP addresses: (expiring at Mon Mar 30 17:03:20 2020 -02)
Preference IPs
5 23.106.125.178
MX Records:
Preference TTL Hostname
5 6h20m13s mail.tinsillo.com
I have allowed all encryption algorithms in ssl settings, as I suspect a mismatch in algorithms.
If I go to ESA -> Mail policies -> destination controls -> and set TLS to none
The hoststatus changes to UP and mails go through.
I do not think it is optimal to manually whitelist domains like this, and having to disable TLS is even worse.
Can you please help me to diagnose and fix this?
