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Questions tagged [relay]

13 questions
2
votes
1 answer

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 relay:mx.myhost.com:587 exemple2.com …
Déjà vu
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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[34.141.161.132]:25, delay=200, delays=0/200/0.14/0.12,…
Stefano
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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 : DHCP Request Relay -> Client : DHCP…
user80551
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1
vote
1 answer

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 am doing some self-hosting stuff. Currently my…
Waiho
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1
vote
1 answer

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 the IP address belonging to such VLAN, but the…
fjulianom
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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 code 550 ?), but I would like to receive an email…
Fnifni
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2 answers

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 know if there is any way to prevent this. Any advice…
adm
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Postfix spoofed messages using an alias which forwards emails back to the sending domain

My Postfix installation has the following alias configured which will distribute incoming emails to the following addressees : alias@my_domain.com - goes to - me@my_domain.com alias@my_domain.com - goes to - co-worker@our_org.com If I send an…
manifestor
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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 two servers that can communicate via a LAN (and…
Tobias Leupold
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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 Fetchmail to grab mails from the said server. I…
Sart
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1 answer

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 exemple1.com relay:[1.2.3.4]:587 exemple2.com …
Déjà vu
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1 answer

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 incoming mail for @example.com (example.com MX 10…
Al Klimov
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1 answer

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 complete version #postmap /etc/postfix/sasl_passwd #…
Maanic Tech
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