Questions tagged [relay]
The relay tag has no usage guidance.
29
questions
2
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Postfix sasl_password file and MX resolution
Thanks to @AlexD idea, we'll implement the following transport table in order to simulate a IP failover using the DNS MX resolution (postfix 3.3)
Relay for 2 domains, exemple[12].com
exemple1.com ...
- 5,646
1
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1
answer
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Postfix transport map with failover entries?
Postfix relays a few domains to a fixed IP address, or its failover address.
1.2.3.4 and 11.12.13.14 (failover)
These two IP addresses are where the relay should occur.
Currently, transport_map
...
- 5,646
1
vote
1
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775
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Windows DHCP Server does not give correct IP
I have a Windows DHCP Server with many scopes, each one related with a VLAN, and I have a PC connected to a switchport. Then, I am changing the access VLAN on this switchport to see if the PC receives ...
- 21
1
vote
0
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398
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Configuring postfix to use SendGrid SMTP relay with fixed FROM address but need to append REPLY-TO of original sender
I have been trying to resolve for a couple of months using multiple different configurations.
The local delivery to a Dovecot mailbox ([email protected]) keeps the original sender (sender@gmail....
- 11
1
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0
answers
138
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Postfix - some mails not sent to particular domain and syslog tagging issue
I have a problem with e-mails sent to a particular domain (alice.it).
Usually the mail is corrected sent and in my postfix log I have this:
06104180AF: to=<**********@alice.it>, relay=mx.tim.it[...
- 11
1
vote
1
answer
235
views
Is it legal for a DHCP relay agent to relay RENEWAL requests that were directly unicast to the "Server identifier" server?
I'm observing the following in a packet capture.
Client -> Broadcast : DHCP Request
Relay -> Client : DHCP Ack (Option 54 == Server)
... After T1 expires ...
Client -> Server Identifier ...
- 111
1
vote
1
answer
3k
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WireGuard policy-based routing
This question is about configuring a WireGuard relay that routes all its peer's traffic to another WireGuard server, but the relay itself does not use that WireGuard server as the default gateway.
I ...
- 33
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1
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76
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Using Postfix as relay to upgrade encryption
I have some embedded devices which receive no more firmware upgrades. They are only capable of sending mails with TLSv1.1 which is no longer supported by public mail servers.
So my idea is to setup a ...
- 1
0
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2
answers
2k
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How to prevent unauthorized relay of mail in Postfix
It seems that our mail server is being used to send spam.
The sender of the email is a spoofed real account on our server.
There is no email in the sent history for that account.
I would like to ...
- 3
0
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1
answer
49
views
How to send email from smtp server1 to smtp server2 (Postfix) via client?
How to make server1 with postfix can send email to server2 with postfix by redirecting DNS query to it (type forward). These servers are on the same local network. Server1 is to receive a non-...
- 1
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1
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241
views
postfix as relay - send to non local domain restrict by ip
we are moving from an old symantec messaging gateway to a debian/postfix machine.
rules in symantec are these:
-from local domain to the same, accept from all then relay all to outlook.com server.
-...
- 93
0
votes
1
answer
115
views
How to prevent postfix from sending e-mails without authentication
my first post here.
I had a postfix that I'm using as a relay.
I configured to use authentication with the following main.cf: https://pastebin.com/TQfmAQp2
The problem is: when I try to send an e-mail ...
0
votes
1
answer
153
views
Postfix relay denied
I have installed Cyberpanel with postfix installed
I am facing Relay Denied error while sending out the emails i.e.gmail.com or any other external
I have tried googling and read many posts but not ...
- 21
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0
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198
views
Is it possible with CSF firewall, to forward IP traffic transparently?
In /etc/csf/csf.redirect
10.100.100.115|*|10.200.200.186|*|tcp
10.100.100.115|*|10.200.200.186|*|udp
I have the following config, now when I connect to https://10.100.100.115/ (nginx+php) with script ...
- 1
0
votes
1
answer
320
views
Original DKIM signing is not sent when using SMTP relay
We are using a VPS (ubuntu 18, postfix) to send mails for multiple domains hosted on a server (AlmaLinux 8). For example from the domain "domain.com".
VPS is maildomain.com
Hosting server ...
- 1
0
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0
answers
166
views
Postfix relay mails not from "mynetwork" or "authenticated users"
I have some trouble understanding Postfix-configuration and have the current situation:
I had one server with Plesk using Postfix as primary MX for several domains. Now - to reduce spam - I want to ...
0
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0
answers
219
views
Postfix - Forward mail externally through relay
I manage the mail server for mydomain.com. Some users have a local IMAP mailbox, but for some their address is an alias and I'd like to forward their message to their external address. I've configured ...
- 101
0
votes
1
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46
views
POSTFIX : Relaying all domain users from postfix server to exchange
I deleted my post and re-created it to be as clear as possible.
I m a beginner with postfix.
So, I have a postfix server relaying mail to my exchange 2016 server.
I want all domain users to be allowed ...
- 165
0
votes
1
answer
506
views
Why is my client server unable to send emails over port 587 while a telnet connection to my mail server is possible?
Host cannot send mail over relay host with port 587.
I have two servers. One mail server and one server that uses the mail server as a relay host.
The client server should send over Port 587.
A telnet ...
0
votes
1
answer
490
views
Postfix - Relay - authentificatin in Mysql
I tryed to manage with a postfix server, my goal is that :
When 1 special user ([email protected]) try to send mail, it will use routing (using a relay server is OK) but I don't understand how to send ...
- 1
0
votes
0
answers
379
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postfix configuration to prevent bounces when relaying to 3rd party (e.g. src -> my@work -> my@gmail)
i have an active mail relay that is using aliases as a main tool,
at some point we started to get bounces for some emails.
Source: somerandomsenderdomain.com
Destination: myemaildomain.com
...
0
votes
1
answer
90
views
Relay emails to another server
I'm hosting all my users websites on server1, it has multiple websites, e.g. user1.com, user2.com, user3.com ...
Our upstream provider no longer support reverse DNS, so I need to use server2 to help ...
- 1
0
votes
0
answers
266
views
postfix relay - send message to a non-existing mail address does not fail
I have a docker-mailserver with a relay on a tiers server (Oracle cloud email delivery).
When I send a message to a non-existing address (e.g. to gmail), I get a Code 250 Ok Sent (should not it be a ...
- 101
0
votes
2
answers
925
views
Is it possible to send mails via Postfix on another machine in the same LAN without having to relay it?
I thought this was a quite common situation, but I'm struggling a bit getting this to work in the easiest way possible, and also, I'm not sure if I'm doing it in a good/recommended way by now.
I have ...
- 173
0
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0
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368
views
Fetchmail + Postfix - can't make them work together
Task is the following:
There is a mail server in a secure zone with no access to Internet and/or other networks. I need to relay contents of one of the mailboxes to Amazon SES for delivery.
I set up ...
- 63
-1
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1
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99
views
DKIM *seems* to be used as an open relay. Is this possible?
I'm running postfix with opendkim. My opendkim milter is running on port 10029.
CORRECTION: My opendkim milter is running on a unix socket, and there is a DKIM content filter set up on port 10029.
...
- 230
-1
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1
answer
419
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mail relay routing FROM domain with dkim
Current setup
First of all i must say that im so so (read like "nothing know") in things like postfix or open dkim.
We have many domains on our exchange (realy a lot). and thats work like &...
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-2
votes
1
answer
60
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Separate eMail relay: DNS requirements beyond PTR record?
Some cloud business offers "always-free" VM instances. Not quite big, but enough for me, so I’m going to migrate my infrastructure there, including mail.example.com. That machine handles ...
- 100
-4
votes
1
answer
3k
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SMTP send error Client does not have permission to submit mail to this server. The server response was: 4.7.1 : Relay access denied
This error comes on my server when I am sending mail outside my domain like to Google, Microsoft, etc. Below is my Postfix config file.
# See /usr/share/postfix/main.cf.dist for a commented, more ...
