421 4.5.1 No more messages on this connection http://tele.dk/25153

-
article1

tele.dk is an ISP from Denmark. As per the Postmaster guidelines, tele.dk mail servers do not accept more than 3 messages per connection, if you attempt to send more emails, you would get the following error message :

421 4.5.1 No more messages on this connection, see http://tele.dk/25153

The following quick How-to explains, how to configure Postfix to limit number of messages per smtp connection / session to danish domains which are hosted by tele.dk.

Note: The following configurations worked on Postfix 3.2.3.

Add the following to /etc/postfix/main.cf

# mail.dk transport
transport_maps = hash:/etc/postfix/transport
teledk_initial_destination_concurrency = 3
teledk_destination_concurrency_limit = 3

Add the following to /etc/postfix/transport

.mail.dk        teledk:
.tdcadsl.dk     teledk:
.tele.d         teledk: 
.dknet.dk       teledk: 
youseeme.dk     teledk:
besked.com      teledk: 
beskedboks.dk   teledk:

You can add more domains by reviewing logs. These are some of common domains. “.mail.dk” refers to any subdomain.
Add the following to /etc/postfix/master.cf

teledk unix    -       -       n       -       -       smtp

Update lookup table

postmap hash:/etc/postfix/transport

Reload Postfix

  systemctl reload postfix

Comments

  1. AnonymousFebruary 2, 2022 at 8:33 AM

    Online casinos that have games with real money on offer
    Live Casino. Livecasino. Live casino games with real money on offer is a 카지노사이트luckclub big part of the world of online gambling, which is what makes

    ReplyDelete
  2. AnonymousDecember 2, 2022 at 10:52 AM

    As of 2016 Kangwon Land Casino remains to be the only place South Koreans can play casino games legally. Many of the opposite sixteen currently 점보카지노 operating casinos are small venues positioned inside 4-star and 5-star resorts catering to international visitors. However, licenses have been issued and building has begun on full-scale built-in resorts corresponding to Paradise City and Inspire Integrated Resort. The benefit of half in} roulette is that there is no a|there isn't any} strategy required to win.

    ReplyDelete

Post a Comment

Popular posts from this blog

How to configure OpenDKIM with Postfix

-
article1 In this HowTo, you will find out how we configured OpenDKIM and Postfix(3.1.0) to sign our @postfix.io emails with DKIM. I will not talk about what is DKIM and settings like hash algorithms, DKIM Identity, Selectors etc. Install OpenDKIM and tools. apt-get install opendkim opendkim-tools Add the following settings to /etc/opendkim.conf after “UserID” directive. Map AuthorDomains to RSA keys.KeyTable /etc/dkimkeys/rsakeys.tableSigningTable refile:/etc/dkimkeys/signingdomains.table# "simple" recommended by DKIMCoreCanonicalization simpleMode svSubDomains noAutoRestart yesAutoRestartRate 10/1MBackground yesDNSTimeout 5SignatureAlgorithm rsa-sha256OversignHeaders From Generate RSA key for @postfix.io cd /etc/dkimkeys/opendkim-genkey --bits=1024 --selector=key1 --domain=postfix.io --append-domain It will create two files. “ key1.private ” which is for server side and “ key1.txt ” which contain the following DNS record that needs to be created i
Read more

StatusDnsQueryFailed resolving domain

-
Welcome file If you are seeing the following error in PowerMTA or Postfix logs : StatusDnsQueryFailed resolving domain It’s likely caused by 3 reasons : The requested domain does not exist. It doesn’t have neither MX nor A record. The upstream DNS provider is throttling excessive queries from your mail server. You are hitting bandwidth limits on either WAN(if the dns resolver request is going out via internet interface). As always, i highly recommend to use dedicated recursive DNS server on LAN for your mailing infrastructure or use unthrottled upstream DNS resolver.
Read more

How to include Gmail's Feedback-ID header in DKIM signature

-
article1 Feedback-ID is an additional header required by Gmail Feedback Loop to see aggregated data in Google Postmaster tools . Gmail requires it to include in DKIM-Signature. The following guide explains how it can be configured in OpenDKIM : Edit opendkim.conf vim /etc/opendkim.conf Add the following line : SignHeaders Feedback-ID Reload openkdim : systemctl reload opendkim.service Reload postfix : systemctl reload postfix.service Send a test email with swaks to gmail : swaks --from postmaster@postfix.io --to xxxx@gmail.com --h-Feedback-ID 123:asd:123 --server 127.0.0.1:25 My test mail results : Authentication-Results: mx.google.com;dkim=pass header.i=@postfix.io header.s=key1 header.b=oY1NVInb;spf=pass (google.com: domain of postmaster@postfix.io designates 45.55.57.182 as permitted sender) smtp.mailfrom=postmaster@postfix.io;dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=postfix.io Date: Sun, 12 Nov 2017 11:04:42 +0000 DKIM-Signature: v=1
Read more