1 Topic by communque

  • communque
  • Member
  • Offline
  • Registered: 2024-04-01
  • Posts: 65

Topic: Emails delivery delay. Emails delivered in batch next day

==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version:  iRedMail-1.7.0
- Deployed with downloadable installer
- Linux/BSD distribution name and version: Ubuntu 24.04 LTS
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): PGSQL
- Web server (Apache or Nginx): Nginx
- Manage mail accounts with iRedAdmin-Pro? No
====

Trying to trouble-shoot why emails sent on one day are not delivered until the next.

It's as if the server is asleep and wakes up at 9:15am (UTC) and then delivers the backup of emails all at once.

I thought that maybe the machine hosting iRedMail was maybe going to sleep but it's perfectly responsive the entire time, suggesting the actual cause is some setting within iRedMail or one of the apps / settings.

What might account for this?

----

Spider Email Archiver: On-Premises, lightweight email archiving software developed by iRedMail team. Supports Amazon S3 compatible storage and custom branding.

2 Reply by jackb (edited by jackb 2024-08-15 04:07:39)

  • jackb
  • Member
  • Offline
  • From: Ireland
  • Registered: 2019-05-06
  • Posts: 117

Re: Emails delivery delay. Emails delivered in batch next day

communque wrote:

==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version:  iRedMail-1.7.0
- Deployed with downloadable installer
- Linux/BSD distribution name and version: Ubuntu 24.04 LTS
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): PGSQL
- Web server (Apache or Nginx): Nginx
- Manage mail accounts with iRedAdmin-Pro? No
====

Trying to trouble-shoot why emails sent on one day are not delivered until the next.

It's as if the server is asleep and wakes up at 9:15am (UTC) and then delivers the backup of emails all at once.

I thought that maybe the machine hosting iRedMail was maybe going to sleep but it's perfectly responsive the entire time, suggesting the actual cause is some setting within iRedMail or one of the apps / settings.

What might account for this?

Most Mail Servers have something called Greylisting enabled to help combat with SPAM, if you are sending a few emails at once those emails will be stuck in a Greylist Queue until your SMTP Server sends the mail a second time, /var/log/mail.log will tell you a lot more.

Another thing to take into account, if DKIM, DMARC, SPF & Reverse DNS isn't configured properly then this can cause delivery problems.

On both of my SMTP Servers I have implemented something called OpenDMARC which validates a Domain that has DMARC implemented or not, also implemented OpenSPF too.

Sending bulk emails can be classed as SPAM too.

Regards

3 Reply by communque

  • communque
  • Member
  • Offline
  • Registered: 2024-04-01
  • Posts: 65

Re: Emails delivery delay. Emails delivered in batch next day

jackb wrote:

Most Mail Servers have something called Greylisting enabled to help combat with SPAM, if you are sending a few emails at once those emails will be stuck in a Greylist Queue until your SMTP Server sends the mail a second time, /var/log/mail.log will tell you a lot more.

Another thing to take into account, if DKIM, DMARC, SPF & Reverse DNS isn't configured properly then this can cause delivery problems.

On both of my SMTP Servers I have implemented something called OpenDMARC which validates a Domain that has DMARC implemented or not, also implemented OpenSPF too.

Sending bulk emails can be classed as SPAM too.

Regards

Thanks for following up on this.  Been mired on another problem.  Testing this now.  More news hopefully soon.