Questions tagged [smtp-auth]

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How to get gmail to use postfix as an SMTP server

I'm trying to get gmail to send email from my vanity domain - it understandably wants to use an SMTP server set up for that domain. I tried to configure postfix to be an SMTP server for my vanity ...
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1answer
26 views

Outlook 2010 can receive but not send - authentication fails - Thunderbird works

After the mailserver was upgraded from CentOS6 to CentOS 7, Outlook 2010 on Windows 7 can receive email but not send, the error says authentication failed. However Mozilla Thunderbird can receive and ...
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1answer
772 views

Roundcube Webmail

I have an extremely frustrating situation with Roundcube Webmail: A client of mine has asked for a WordPress server and a full service email system. The email system is registered already, and ...
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1answer
57 views

Configure smtp server ssl for different domains

I have a problem which I have been trying to solve for weeks but cannot find a working solution. I have a webserver with 5 different domains. I am using Outlook365 as mail server so no local email ...
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1answer
91 views

Forward plain-text emails to TLS enabled SMTP server?

I am running old applications that are not supporting any encryption/authentication protocol on outgoing e-mails. Is it possible to send plain-text emails to a local "relay" server that forward it ...
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0answers
43 views

Allow exchange server to send emails from any sender with valid SMTP auth without delegation?

I'm using Exchange Server 2019 and really enjoy the product and security. One feature I find great is that just because you have SMTP AUTH you can't send as some sender unless that sender allows the ...
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1answer
385 views

How to debug “lost connection after STARTTLS”?

We have a web server which sends mail out via our Postfix relay over a LAN connection. Users from outside our network also send mail out via SMTP AUTH though that relay too. However, we have a ...
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232 views

“smtp;550 5.6.0. Sorry, looks like SPAM to me”

I'm applying for a tech support job and I got a test that I have a week to complete, so I assume they expect me to do some research for it, so I was wondering if anyone here might be willing to lend a ...
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1answer
123 views

TLS from unknown: No client certificate presented

We have setup a windows server virtual SMTP (under IIS6 manager). In the SMTP settings, TLS encryption is enabled, fqdn field is "sharepoint.mycompany.com". In the server's cert store "personal" ...
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232 views

Configure SASL on Centos 7 Postfix/Dovecot/MariaDB setup [duplicate]

I'm trying to set up SASL on my existing Postfix + Dovecot setup with virtual users in MariaDB. Authentication fails: systemctl status postfix -l ... postfix/smtpd[17389]: fatal: no SASL ...
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1answer
97 views

How to identify mail user from Syslog and mail.log? [duplicate]

I have a user on my system who appears to be sending large quantities of mail and I'm having difficulty identifying who he is. I don't know his IP address or username by which he authenticated. One ...
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1answer
195 views

Can't telnet to Postfix SMTP server after adding smtpd_sasl_auth_enable option

I have the Postfix SMTP server installed on my CentOS 7 machine on port 25. To test that it's working, I connect to it using telnet, like this: # telnet localhost 25 and the result is: Trying ::1....
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0answers
351 views

Exchange 2013 SMTP AUTH “5.7.1 Client does not have permissions to send as this sender”

I'm having an issue sending email via SMTP AUTH on an Exchange server 2013, was hoping someone can give me some ideas on where else to check. I've had this working on other Exchange servers without ...
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1answer
2k views

Server responded: 503 AUTH command used when not advertised\r\n?

I recently migrated from one server where my mail settings worked without a problem to a new server which now results in the following error: Server responded: 503 AUTH command used when not ...
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0answers
890 views

Exchange Server SMTP Auth Login gets rejected

I have an Exchange 2010 Server that denies SMTP logins on a seperate receive connector for no clear reason. For a groupware I have to enable "auth login" on the receive connector. "Basic ...
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1answer
4k views

Setup policyd on Zimbra 8.8.x to rate limit the number of messages each account can send with smtp-auth

I'm running Zimbra 8.8.9 and I'm trying to rate limit the number of messages that a single user can send over smtp after authenticating with smtp-auth. The purpose is to limit the damage in case one ...
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1answer
965 views

Postfix auth issue

I'm currently facing auth issue. When I'm trying to auth via telnet, I face an issue "535 5.7.8 Error: authentication failed: authentication failure" I use password and login the same, as I use for ...
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1answer
1k views

EXIM SMTP allows to send mails without login / authentication via telnet to any domain

I'm ashamed, but I have to ask for help. My server is being used for sending spam, I've found out I can simply connect with telnet (edit: from any server in office, home and even directly from CMD/...
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0answers
188 views

Setup SMTP connection between mautic and iRedMail

I have set up my iRedMail on AWS EC2 small instance, now everything is working fine under port no 25, but I need to authenticate users to authenticate themselves. In mautic "to authenticate we need ...
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1answer
205 views

Trying to make submission (587) work - Exchange 2016

I'm trying to allow the authenticated relay (Client Frontend connector) to process requests from LAN and internet, but I'm struggling so far. First, I have linked this connector to my SSL wildcard ...
2
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1answer
93 views

Reject Exim authentication attempts based on username

Is it possible to set up Exim so that, based on the username passed along to it, it can reject an authentication attempt before it will try to do a password lookup for that username? I've done similar ...
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0answers
616 views

Postfix: How to use reject_sender_login_mismatch when using MySQL virtual users?

I want to force senders to use an envelope sender address that's identical to the SASL login username. From the Postfix SASL README I see I should list, in the smtpd_sender_login_maps option, a hash ...
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1answer
179 views

Authentication succeeds, but sending still fails

I'm trying to configure my home server to relay e-mails from the family's iPhones. To this end I created a single "user" account in the server's SASL-database and configured sendmail to use CRAM-MD5 ...
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1answer
253 views

sendmail authentication with passwords in SHA512 hash

Is it possible for sendmail to authenticate users from LDAP with passwords stored as SHA512 hash ? If yes, how? Edit: OS is Arch Linux and i want to use only LDAP to authenticate users.
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1answer
1k views

postfix: smtpd_sender_login_maps regex matches everything instead of only SASL

I want to prevent spoofing so I found this postfix option: smtpd_sender_login_maps (default: empty) Optional lookup table with the SASL login names that own the sender (MAIL FROM) addresses. ...
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1answer
3k views

Exim not Listening on port 465 or 587 for TLS connection

I am configuring Exim on a Ubuntu server to send and receive mails via TLS. Followed many guides which shows on how to configure Exim with TLS but still my Exim doesn't listen on 465 or 587 Exim ...
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0answers
576 views

How to make nginx mail auth connection persistent?

We are using nginx 1.7.3 as a reverse proxy for our Mail SMTP service. For authentication of each SMTP connection, we have configured nginx to connect with a http based service for authentication. ...
2
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1answer
1k views

postfix not working correctly after system upgrade (no SASL authentication mechanism)

I had a working postfix/dovecot configuration running on a Ubuntu Server machine 14.04 LTS. Then I made a upgrade to 16.04.2 using do-release-upgrade. Everything seemed to work besides my mail service....
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3answers
5k views

linux sendmail doesn't work (stat=deferred)

I have set up an linux webserver on my raspberry pi and now want the server be able to send emails without configuring a complete mailserver. Thats why I have chosen the MTA 'sendmail', which I'm ...
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1answer
698 views

Authenticated External SMTP Relay

Description I am trying to use "Default MAIL-SERVER" (port 2525) receive connector as an authenticated external relay. I am successful with the mailbox "Bob.smith@domain.com" but I am unable do it ...
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2answers
649 views

How to properly use SMTP authentication?

I have been trying to configure Postfix to use SMTP authentication. When I telnet on port 587, I appear to be authenticating correctly, but the mail fails to reach its destination and instead comes ...
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0answers
499 views

Cannot send mail among local machines: No address associated with hostname

I am attempting to send emails between 2 machines with postfix running on both of them. The variables myhostname is properly set to hostname-1 and hostname-2 respectively in /etc/postfix/main.cf: $ ...
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1answer
858 views

Postfix SASL allow SMTP Authentication and relay messages

I am trying to set my SMTP server so it allows only SMTP authenticated users to send emails but the actual sending is done via Mailjet. I am running on Ubuntu 14.04 LTS and Postfix version is ...
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2answers
731 views

Exim doubling up domain name on SMTP-authenticated mail

I'm setting up an Exim 4.87 mailserver with virtual domains stored in a MySQL database. The machine has a hostname of athena.example.com (the example.com of course being fictuous). I want to be able ...
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2answers
14k views

Failed SMTP Authentication - TOSHIBA e-STUDIO255

I do have TOSHIBA e-STUDIO255 and i have configured scan to email option. about one week it's worked perfectly but now it's keep giving me this error "Failed SMTP Authentication". i have not change ...
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1answer
436 views

Contact form from ubuntu to Zoho email address

I would like some support in order to get my Postfix configuration working with my Zoho email account. What I am trying to do is to send a message from my contact form in http://www.g3eo.com/#!/...
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1answer
69 views

SMTP authentification request transfer to another SMTP

I'm having an issue that's above my competence level. As we're working on improving the security measures that are in place in our network, we found (among others) one flaw that we have no idea how to ...
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1answer
127 views

How to restrict SMTP login to its own address in sasldb2? [duplicate]

I'm using sasldb2 (without saslauthd) for SMTP authentication with Postfix. To create a new user, I run saslpasswd2 -u example.com mail which creates a login mail@example.com. However, using these ...
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0answers
3k views

How to allow authenticated User to relay on a Cisco ESA C170 (iron port)

I'am trying to configure my ESA C170 and all works as expected. But now I want to add support for relay function for authed external user. I add a SMTP Auth Profile against LDAP that works. Next Step ...
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1answer
745 views

How can I easily setup a SMTP reverse proxy from EC2 to SES?

How can I easily setup a SMTP reverse proxy from EC2 to SES without revealing SES the original SMTP Client IP?
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0answers
320 views

Sendmail will not accept user ID / pass in SMTPAUTH

To cut down on the possibility of spam, I'm trying to set up SMTPAUTH on my Sendmail (8.14.4 on Mint MATE 17.1 x64) installation. Users can retrieve mail from the server with IMAP or POP (using ...
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1answer
1k views

Javamail using Exchange as relay

I have to fix an "unable to relay". The java server has to send emails to the internet. The java server and the exchange server are in the same network. How I configure properly a receive connector in ...
2
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2answers
2k views

Exim: Force email auth for users of local domains

I'm configuring exim4 for virtual users with dovecot and postgresql and I got a problem I cannot resolve, the situation is this: I need that when a 'localdomain' user tries to send a email to another ...
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0answers
303 views

535 error from gsmtp

I am using Erlang and its esmtp library to send emails from my application. It used to work OK and still works fine on the development machine. Unfortunately several weeks ago it stopped working on ...
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0answers
240 views

failed/unauthorized logins attempts via SMTP/IMAP

My server host sent me this message: 80 failed/unauthorized logins attempts via SMTP/IMAP We have detected abuse from the IP address xx.xxx.xx.xx, which according to a whois lookup is on your network....
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1answer
1k views

Is it possible to use CDO libraries (classic ASP) to send mail to Office 365 / Exchange Online?

I'm working on a migration to Office 365 / Exchange Online for a SMB company which until now has been running a local Exchange 2010 server; we're talking about ~25 mailboxes here. However, there's a ...
0
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1answer
2k views

503 AUTH command used when not advertised exim4 - Outlook

I do keep on getting this error: 503 AUTH command used when not advertised I have seen this question: exim configuration: 503 AUTH command used when not advertised The difference is that I do not even ...
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1answer
831 views

How to configure exim4 for both incoming SMTP for local delivery and relay for authenticated user

I want to use my exim4 mail server as local delivery for anonymous sender for my localdomains, and relay to everyone only for authenticated users. Is it possible?
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0answers
319 views

Postfix permit localhost use plain login

I have postfix 2.11 setup on Debian jessie with Dovecot SASL and I require encrypted login mechanism to send mail via smtp. For this purpose in the main.cf I've smtpd_tls_auth_only = yes option set. I'...
3
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2answers
11k views

postfix/dovecot - how to view smtp auth user in log files?

I am using postfix with dovecot and virtual users on a centos 6 system. I had a rush of spam recently, with tons of packs of 50 recipients delivered from an unknown account. The current logging (...