Deferred: 421 Too many concurrent SMTP connections;

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Deferred: 421 Too many concurrent SMTP connections;

Postby gourmet » Thu Sep 29, 2011 6:02 pm

Subject says it all. That's what SG is replying to SMTP sessions.

After thinking a while I just made this SMTP status check service.

If you find out that email isn't being forwarded normally through SG you can check this url to see SMTP servers status.

http://s.sami-lehtinen.net/c/sc?sg
gourmet
 
Posts: 124
Joined: Thu Mar 27, 2008 4:46 pm

Re: Deferred: 421 Too many concurrent SMTP connections;

Postby lwc » Tue Mar 10, 2020 8:15 pm

The aforementioned URL is dead, any chance you'll bring it back to life?

In any case, lately my hosting can no longer write me any messages!
They told me they simply get "Too many concurrent SMTP connections from this IP address; please try again later."
Their IP is 198.61.254.17 and they welcome you to white list if that's the only way.

Below is their log, what could be done? Thanks in advance!

Code: Select all
"delivery-status": {
"mx-host": "gourmet7.spamgourmet.com",
"code": 421,
"description": "",
"session-seconds": 2.9281630516052246,
"retry-seconds": 14400,
"attempt-no": 7,
"message": "Too many concurrent SMTP connections from this IP address; please try again later."
},
"recipient-domain": "neverbox.com",
"event": "failed",
"campaigns": [],
"reason": "generic",
"user-variables": {},
"flags": {
"is-routed": false,
"is-authenticated": true,
"is-system-test": false,
"is-test-mode": false
},
"log-level": "warn",
"timestamp": 1583648629.919381,
"envelope": {
"transport": "smtp",
"sender": "no-reply@fastcomet.com",
"sending-ip": "198.61.254.17",
"targets": "[censored]@neverbox.com"
},
"message": {
"headers": {
"to": "Name <[censored]@neverbox.com>",
"message-id": "c62aa3c5dc911ec03cd2d1ca651a0c09@my.fastcomet.com",
"from": "FastComet General Support <no-reply@fastcomet.com>",
"subject": "[Ticket ID: 256612] [censored]"
},
"attachments": [],
"size": 2769
},
"recipient": "[censored]@neverbox.com",
lwc
 
Posts: 383
Joined: Sat Aug 28, 2004 9:09 am

Re: Deferred: 421 Too many concurrent SMTP connections;

Postby gourmet » Wed Mar 11, 2020 5:33 am

The server mentioned earlier is currently running in environment where connectivity is really limited on purpose. As example no SMTP connections are allowed.

But there are many other similar or even lot better and versatile tools and SMTP testing services, like the MXtoolbox which is actually quite handy in many situations.

But based on the error message from this IP address, it would indicate it's IP address specific error, and not a global error.
gourmet
 
Posts: 124
Joined: Thu Mar 27, 2008 4:46 pm

Re: Deferred: 421 Too many concurrent SMTP connections;

Postby isbbs.thebluecat » Sat Jun 20, 2020 11:21 pm

Hi Lwc and Gourmet,

Please, also see related issue https://bbs.spamgourmet.com/viewtopic.php?f=4&t=1819&sid=3e75f041ff053e35d21a93668dcb6c4c

We are also still waiting for a SpamGourmet Admin to give us some support. :)

Best regards,

A really happy customer of SpamGourmet
isbbs.thebluecat
 
Posts: 4
Joined: Sun Jun 07, 2020 7:05 pm


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