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Questions tagged [relay]

36 questions
2
votes
0 answers

How do I configure Postfix as the smart host

I have a postfix server configured to send mail to a smarthost. It is successfully authenticating with that smarthost which is another postfix server. The receiving postfix servers has: smtpd_relay_restrictions = permit_my_networks,…
Curtis Maurand
  • 21
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
  • 5,778
1
vote
0 answers

Google's own SMTP Relay has been blacklisted

I am using Google Workspace for our sports club and we've been using the Google SMTP Relay to send out newsletters to our members. We authorized the IP address of the sending server and this has been working fine for 9 months. Last week we saw…
patschiboy
  • 141
1
vote
0 answers

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 (originalto@domain.org) keeps the original sender (sender@gmail.com) in the FROM address. The remote delivery using…
kcfez
  • 11
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1
vote
0 answers

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
  • 21
1
vote
1 answer

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
  • 111
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
  • 43
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
  • 21
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1
vote
2 answers

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
  • 5,778
0
votes
1 answer

Workaround for Google SMTP Relay after "Less Secure Apps" have been disabled?

As of now, I’m no longer able to relay outbound emails through Gmail’s SMTP servers (smtp.gmail.com) because Google has disabled access for Less secure apps. Previously, I was using basic authentication (username/password) to send emails via…
alexus
  • 13,667
0
votes
0 answers

Having `X-Original-To:` header in postfix set to original envelope to, before mail was redirected via virtual maps

This question is based on this one, which I feel belongs better here and has so far not been answered anyway. Similarly to the other poster, I'm using a virtual_alias_map file with my postfix to redirect all mails coming to my domain to a user. My…
E. K.
  • 63
0
votes
1 answer

Are redundant relays in mailertable possible?

We're using 3rd-party relays for some of the external domains. For example, a snippet from /etc/mail/mailertable may look like: example.com relay:[smtp.example.net]:587 example.co.uk relay:[mail.example.org]:587 and I'd like to stack them for…
Mikhail T.
  • 2,405
0
votes
1 answer

Office365 as smarthost: Mail sent to the wrong Office 365 region. ATTR35 (for system mails only)

We are running a on premise exchange 2019 and some users on office 365. It is configured as a hybrid deployment and we created a send connector, to use office 365 as smarthost for our on premise exchange. The smarthost domain is configured with the…
dognose
  • 174
0
votes
1 answer

windows server DHCP multiple scope relay trouble

I want to create 14 subnets (10.10.10.0/23, 10.10.20.0/23, 10.10.30.0/23, etc) I have a DHCP server running on a 15. subnet, 10.100.10.0/24 with the address of 10.100.10.100. The problem that arises is that when I create more than 1 scope in the…
CPlusPlusandHTMLguy
  • 1
0
votes
0 answers

Linux email server configuration: the postfix relay_domains setting and sending email

I am trying to set up an email server on an Arch Linux VPS using postfix and dovecot. I'm using plain unix password authentication, in which dovecot handles SASL authentication for postfix. For the purpose of this discussion, let's say my domain is…
Mark
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