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Questions tagged [smtp-auth]

128 questions
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Postfix multiple IPs: which to use for SMTP AUTH?

I am setting up a mail server which has separate IP addresses for sending and receiving mail. My config looks like this: # The addresses we send out on: smtp_bind_address = 185.xx.xx.101 smtp_bind_address6 = 2001:BA8:xx:xx:xx:A1 # The interfaces…
TommyPeanuts
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Rewrite sender when relaying to provider server

I am trying to relay email thru my provider that has a mail server for my domain (xxxx.com). My postfix is configured as follows: relayhost = [smtp.xxxx.com]:25 the server requires authorization, but it is working correctly. >…
Pepe
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postfix smtp-auth with dovecot cannot authenticate

On Centos 6.5 i run postfix with postconf -n alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases broken_sasl_auth_clients = yes command_directory = /usr/sbin config_directory = /etc/postfix content_filter =…
mardon
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Email server fails to authenticate my client, returns "use web to login"

I'm trying to send a mail message using System.Net.Mail.SmtpClient via Yandex Mail and have the following transcript: S: 220 smtp17.mail.yandex.net ESMTP (Want to use Yandex.Mail for your domain? Visit http://pdd.yandex.ru) C: EHLO my.domain.name S:…
sharptooth
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Can I send email unauthenticated to an internal SMTP server which then relays onto authenticated SMTP?

I have a back-end system which only supports sending email to an UNauthenticated SMTP server, however, ultimately it needs to go via an authenticated SMTP server on the public internet. My idea was to send it internally to a local SMTP server…
Mike
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Spamming from Exchange 2003

I am apparently spamming the world (about 1000 a day) but cannot figure out how. Mxtoolbox does not list me as an open relay and I have disabled all relays that I can find. I have run every virus scan known to man. The only way I can stop it is…
spammer
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Postfix: Relay access denied through SASL with permit_sasl_authenticated setted

I have Postfix 2.7 installed in Ubuntu 10.04 LTS. When I try to send a mail from Outlook (with smtp auth) to a gmail account (or others), I get relay access denied. The log (I've faked the emails): Feb 24 16:49:16 vm1613 imapd: Connection,…
apelliciari
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Postfix Authentication Issue

I originally followed this guide to get my mail server going. It works great but is a security nightmare, so piece by piece I'm securing it (anti virus, spam, smtp security, TLS) I'm currently trying to require smtp clients to authenticate to my…
David
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exim greylisting non-auth SMTP mail?

I have smtp auth set up on my exim4 Dqueeze server so that only auth'ed clients can use it as a mail relay. I believe this is working, e.g. thunderbird (w/out password) reports that I am "not yet authorised to send mail for X from Y". I also have…
artfulrobot
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Postfix: combine check_client_access and check_sender_access for Relayaccess

We have a mailserver running on Postfix. Only authenticated users are allowed to send emails. One client has a multifunction printer, which is configured to send scanned documents to an email recipient. Unfortunately that printer is an older model…
Lukas
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How to reject relaying e-mail from users impersonating myself to myself

Trying to use my server as a relay to send mail to another server gives you relay access denied, this is correct behavior. MAIL FROM: admin@myserver SMTP -> FROM SERVER: 250 2.1.0 Ok RCPT TO: admin@gmail.com SMTP -> FROM SERVER: 554 5.7.1 : Relay…
Shoshomiga
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Protecting server from smtp auth relay attack

Server configuration OS Centos 5.xx SMTP exim / dovecot I would like to know how to protect my server from smtp relay attacks. Currently my server is experiencing smtp relay attack because of which it is sending spam mails i can't get how, i suspect…
Sudesh
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Postfix SASL error

I'm trying to configure my postfix server to accept connections from outside mail clients using SASL authentication with dovecot. It was previously setup with cyrus sasl. However when I try to send mail from another server using Mozilla…
JavaDev
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smtp sasl authentication failure

I have configured and fixed almost all the problems with my postfix +courier + mysql setup for virtual mailboxes. I can now receive mail and send it from webmail (squirrel). BUT, what I can't do is authenticate from outside client. Since my isp…
cromestant
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Client is sending SMTP emails but they are not recorded in the "Sent" folder in webclients

I have been using instantly.ai to send emails. I connected IONOS.ca and JustHost.com mailboxes to instantly and it works fine (warmup, receiving and sending [yes other emails receive the emails sent, and my mailbox inboxes show the warmup emails are…
Guest Man
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