[GH-ISSUE #1539] Bad smtp connection time #1211

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opened 2026-02-27 11:15:53 +03:00 by kerem · 4 comments

kerem commented

2026-02-27 11:15:53 +03:00

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Originally created by @makakken on GitHub (Jul 19, 2018).
Original GitHub issue: https://github.com/modoboa/modoboa/issues/1539

Impacted versions

Modoboa: 1.10.6
installer used: Yes
Webserver: Nginx

Steps to reproduce

Install Modoboa on a cloud node and setup MX records in DNS, go to mxtoolbox.com and SMTP:xxx.xxx.xxx.190 test your mailservers ip

Current behavior

	SMTP Connection Time	6.950 seconds - Warning on Connection time	More Info
	SMTP Transaction Time	9.188 seconds - Not good! on Transaction Time

Expected behavior

No Warnings. A hint in Documentation for Installation Requirements would be nice too.
( 1cpu? 2gb ram? is that enough? i've doubled, but still have same problem)

Video/Screenshot link (optional)

Originally created by @makakken on GitHub (Jul 19, 2018). Original GitHub issue: https://github.com/modoboa/modoboa/issues/1539 # Impacted versions * Modoboa: 1.10.6 * installer used: Yes * Webserver: Nginx # Steps to reproduce Install Modoboa on a cloud node and setup MX records in DNS, go to mxtoolbox.com and SMTP:xxx.xxx.xxx.190 test your mailservers ip # Current behavior | SMTP Connection Time | 6.950 seconds - Warning on Connection time | More Info -- | -- | -- | -- | SMTP Transaction Time | 9.188 seconds - Not good! on Transaction Time # Expected behavior No Warnings. A hint in Documentation for Installation Requirements would be nice too. ( 1cpu? 2gb ram? is that enough? i've doubled, but still have same problem) # Video/Screenshot link (optional)

kerem closed this issue

2026-02-27 11:15:53 +03:00

kerem commented

2026-02-27 11:15:54 +03:00

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@tonioo commented on GitHub (Jul 19, 2018):

@makakken I'm not sure to understand what the problem is. Are you complaining about the connection time being too long?

@tonioo commented on GitHub (Jul 19, 2018): @makakken I'm not sure to understand what the problem is. Are you complaining about the connection time being too long?

kerem commented

2026-02-27 11:15:54 +03:00

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@Toniob commented on GitHub (Jul 20, 2018):

Hi,
The modoboa installer enables postscreen by default : http://www.postfix.org/POSTSCREEN_README.html .
It activates several features against bots, but with a cost of a small delay during the connection (which is not a problem, email being asynchronous).

If you want to get rid of the warning, just disable postscreen. But then, be prepared for dumb bots to spam your server. It's your choice.

@Toniob commented on GitHub (Jul 20, 2018): Hi, The modoboa installer enables postscreen by default : http://www.postfix.org/POSTSCREEN_README.html . It activates several features against bots, but with a cost of a small delay during the connection (which is not a problem, email being asynchronous). If you want to get rid of the warning, just disable postscreen. But then, be prepared for dumb bots to spam your server. It's your choice.

kerem commented

2026-02-27 11:15:54 +03:00

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@makakken commented on GitHub (Jul 20, 2018):

@tonioo yes ;) i had some problems connecting from apple mail via smtp.
@Toniob Thanks for pointing that out. Maybe we could add this to documentation?

So, it's not a bug, it's a feature. good to know.

@makakken commented on GitHub (Jul 20, 2018): @tonioo yes ;) i had some problems connecting from apple mail via smtp. @Toniob Thanks for pointing that out. Maybe we could add this to documentation? So, it's not a bug, it's a feature. good to know.

kerem commented

2026-02-27 11:15:54 +03:00

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@makakken commented on GitHub (Jul 20, 2018):

/close

@makakken commented on GitHub (Jul 20, 2018): /close

kerem referenced this issue

2026-02-27 12:09:42 +03:00

[PR #1215] [MERGED] Check MX validity when adding new domain. #2160