SSL communication between MTAs

Hello, My MTA (postfix) has both 25 (non-SSL) and 465 (SSL) ports enabled. How to enforce the peer MTA send messages only to 465 port for better secure communication? Can I just shutdown port 25? Thanks.

Re: SSL communication between MTAs

Hi, on 2019/8/15 15:44, a wrote: Maximum that you can do - enable STARTTLS and configure MTA-STS (rfc8461). Is there a guide for that? thanks.

Re: SSL communication between MTAs

These info are really helpful. thanks. On 2019/8/15 星期四 下午 11:29, Viktor Dukhovni wrote: On Thu, Aug 15, 2019 at 02:52:12PM +0800, Eliza wrote: My MTA (postfix) has both 25 (non-SSL) and 465 (SSL) ports enabled. Don't confuse port 25 used for (MTA-to-MTA) SMTP (inter-domain email

default outgoing encoding

Hi, if MUA lacks to set encoding, where for postfix to setup the default content encoding (for example, utf8) for outgoing messages? thanks

Re: default outgoing encoding

Hi Viktor, on 2019/8/19 13:29, Viktor Dukhovni wrote: I'm afraid that only the MUA can set the correct character set of the various textual parts of a message. The implicit default is "us-ascii" [1], and anything else, e.g. "UTF-8" [2] is the MUA's responsibility: Content-Type: text/plain

postfix with AWS S3

Hello, Does postfix have a plugin who can be integrated with AWS's S3 as object storage? Coz for a large email service, the local disks are too limited. thanks & regards, Eliza

Re: postfix with AWS S3

Hi, on 2019/8/20 11:26, Eero Volotinen wrote: How about using NFS in AWS? https://aws.amazon.com/efs/ S3 can be called from remote, but not NFS. Am i right? regards.

Re: build failure with glibc-2.30

HI on 2019/8/20 14:23, Eray Aslan wrote: etc. Fixed in Postfix 3.5. You cn delete the offending lines. Which distro are you building on? That was on gentoo. Sorry didnt think of checking on postfix-3.5. Just be curious for what reasons we choose to build a software from sources? today it's

postfix with JMAP

Hi, will postfix get JMAP compatible in future? see: https://jmap.io/ thanks.

Re: Default connection limiting?

hi on 2019/8/22 14:49, MRob wrote: Sometimes they cann't connect but I dont know why. what did postfix server return? You may check the logs of DA (Delivery agent). regards.

Re: Webmin and DKIM

Hi on 2019/8/28 0:45, Linda Pagillo wrote: Good day everyone. Quick question and please forgive me if this is redundant. I have a Postfix server running on CentOS7 and I use Webmin to manage it. Is there a way for me to set up and configure DKIM using Webmin? I have been searching Google and t

about MTA's 4xx response code

I know postfix returns 4xx Response Code for Temporarily Deferred, as below: - The following addresses had fatal errors - [Status: Error, Address: , ResponseCode 421, 4.7.0 Temporarily Deferred] Message will be retried for 4 more day(s) I don't like every MTA returns this 4xx code, t

Re: about MTA's 4xx response code

Hello, on 2019/8/29 10:42, Andrew Bernard wrote: 421 Temporary System Problem. Try again later. 421 Try again later, closing connection. 421 Server busy, try again later. The SMTP error 421 is normally used for temporary problems on the mail server or a problem with the recipients email accoun

Re: about MTA's 4xx response code

on 2019/8/29 11:30, Bill Cole wrote: Which is their absolute right to do for whatever reason they see fit. It is NOT "abuse" in any sense. Andrew didn't mention the enhanced status codes of RFC3463, which include the '4.7.0' you are seeing in error messages. That is a generic, intentionall

what's an encrypted mail service?

Does it mean messages get encrypted in tranfer process and message storage is encrypted in rest? Why so many encrypted mail providers like protonmail, tunanota say they have privacy advantages than traditional mail providers (for example, gmail)? Thanks for any guide. Eliza