New Question
 
 
PRTG Network Monitor

Intuitive to Use.
Easy to manage.

300.000 administrators have chosen PRTG to monitor their network. Find out how you can reduce cost, increase QoS and ease planning, as well.

Free PRTG
Download >>

 

What is this?

This knowledgebase contains questions and answers about PRTG Network Monitor and network monitoring in general. You are invited to get involved by asking and answering questions!

Learn more

 

Top Tags


View all Tags


Can't Send Email to Gmail?

Votes:

0

Your Vote:

Up

Down

Hi all,

Thanks in advance for reading my post and for any advice you might be able to offer.

A few days ago, we noticed that email alerts weren't arriving to some users. Luckily, I happened to catch a note in the logs:

Status sending Email: "[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected]" The user you are trying to contact is receiving mail at a rate that prevents additional messages from being delivered. For more information, please visit https://support.google.com/mail/?p=ReceivingRatePerm w1si1958769ejc.440 - gsmtp "[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected]" The user you are trying to contact is receiving mail at a rate that prevents additional messages from being delivered. For more information, please visit https://support.google.com/mail/?p=ReceivingRatePerm n20si2026575ejo.160 - gsmtp (Sensor/Source/ID: 10228/3627/1)

This message seemed to appear twice, although the other instance of it was not repeated twice in the same log as it was above, and it was only for two users.

After this log message, it seems that emails to the Gmail platform no longer work. I can send test emails to an alternate email from Setup > Notification Delivery > Test SMTP Settings and they work fine, but emails to a Gmail domain do not.

This is the log output for the different test emails (Log > System Events > Notification Related):

[email protected]: Status sending Email: DNS Server: 8.8.8.8 E-Mail: [email protected]" OK

[email protected]: Status sending Email: DNS Server: 8.8.8.8 E-Mail: [email protected]" OK

[email protected]: Status sending Email:

[email protected]: Status sending Email:

The obvious answer is that we were rate limited by Gmail, and I know the page says to wait, but its been 4-5 days now and the issue persists. If I'm not mistaken, our email alerts were being flagged as spam by Gmail just before this happened. We had that issue once in the past but were able to get around it after we had everyone go and mark the emails as "not spam". I will have them try that again now that I am thinking about it.

Anyone had an issue like this? Any advice? We are using the " Direct delivery using built-in email server (default) " option to send notifications.

Thanks for your time!

alerts email gmail prtg rate-limiting

Created on Sep 9, 2020 12:50:58 PM by  stelker (0) 1

Last change on Sep 9, 2020 2:01:04 PM by  Moritz Heller [Paessler Support]



1 Reply

Votes:

0

Your Vote:

Up

Down

I can tell you, that Exchange Online also has rate limits and it is a proper way to prevent overloading systems and mailboxes. (DDoSAttacks)

https://support.google.com/a/thread/10476034?hl=en = Gmails posted rate limits are 60 messages/minute, 300 message/5 minutes.

Exchange Online:
Exchange Online limits - Receiving and sending limits: https://docs.microsoft.com/de-de/office365/servicedescriptions/exchange-online-service-description/exchange-online-limits#receiving-and-sending-limits

Yahoo:
Yahoo SMTP Sending Limits: https://help.smallbusiness.yahoo.net/s/article/SLN17655

So it is "normal" and not "by SourceIP". Maybe the mailboxes are already near the upper limit even without getting PRTG-messages ?

Created on Sep 14, 2020 1:36:13 PM by  Frank Carius (341) 1 1

Last change on Sep 15, 2020 7:13:25 AM by  Moritz Heller [Paessler Support]



Please log in or register to enter your reply.


Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.