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Questions tagged [sasl]

Simple Authentication and Security Layer (SASL) is a framework for authentication and data security in Internet protocols.

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Outlook timeout when adding IMAP account (dovecot, postfix)

I am adding a Postfix /dovecot mail server in Outlook 2016. It works on my phone and I can successfully authenticate using: doveadm auth test user pass postconf -n alias_database = hash:/etc/aliases ...
Slenti's user avatar
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1 answer
40 views

Can authentication with a relay be disabled for a specific address in smtp_sasl_password_maps?

Some email hosters are jerks. No matter your blacklist standing, SPK, DKIM, or DMARC, they will block your emails. To deal with that, I've set up a relay using sender_dependent_relayhost_maps. There ...
Banyoghurt's user avatar
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1 answer
150 views

Can postfix enforce reject_unknown_helo_hostname before permit_sasl_authenticated?

I have a working postfix 3.5 relay where the config includes: smtpd_client_restrictions = permit_mynetworks, reject_unknown_client_hostname, permit smtpd_helo_required=yes ...
Jonathan Wakely's user avatar
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0 answers
105 views

Postfix/Dovecot fails to send emails "SASL PLAIN authentication failed" - no further message

I have been all around the houses trying to configure Postfix and Dovecot so I can send through my domain from Gmail, which as far as I know is simply Gmail acting as a regular SMTP client talking to ...
glenatron's user avatar
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1 answer
206 views

Postfix - SASL Cyrus saslauthd authentication failed

Goal: Configure smtpd to authenticate connections by using postfix, cyrus, saslauthd, pam and mysql. Investigation Authentication via courier-pop3 & courier-imap using mysql works saslauthd ...
Mathew's user avatar
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1 vote
0 answers
90 views

Sasl connection refused

i am trying to run a selfhosted mailserver using postfix and dovecot. firstly i configured only postfix without dovecot and that worked fine but i wanted to use a mail client so i installed dovecot to ...
kajvans's user avatar
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1 answer
280 views

Postfix / sasldb : "authentication failure"

I'm not a postfix expert... I'm having an authentication problem with posfix 3.5 on debian 11.8. I've added a test user : # saslpasswd2 -c test Password: test Using swaks to test authentication to ...
lc63's user avatar
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1 vote
0 answers
357 views

Configuring cyrus to use oauth2 via keycloak with ldap backend?

We are using cyrus (and exim) as a long-running mail server. The requirement to store passwords in email programs seems to be a security risk to me. I would like to move auth behind something like ...
till's user avatar
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-1 votes
2 answers
620 views

Postfix smtpd and smtp restrictions (client, sender, recipient) first restriction that matches wins very ILLOGICAL for brute force attacks

if I have a list of restrictions for: smtpd_client_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_rhsbl_helo dbl.spamhaus.org, reject_rhsbl_reverse_client dbl.spamhaus....
Digital Joe George's user avatar
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157 views

postfix secure & insecure connections

I have configured postfix SMTP server for mail sending only with below configurations, I've used cyrus-sasl to authenticate with openLDAP, I want to achieve SMTP port 25 to use insecure connections ...
csx4's user avatar
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0 answers
205 views

Why am I getting Sasl errors when trying to authenticate to SES with Postifx?

I am getting these two errors in my mail logs: Aug 25 22:51:23 ns1 postfix/smtpd[246267]: warning: unknown[94.156.102.101]: SASL LOGIN authentication failed: authentication failure Aug 25 22:55:22 ns1 ...
cantfetzthis's user avatar
0 votes
0 answers
82 views

OpenLDAP + GSSAPI/Kerberos SASL

I have OpenLDAP 2.5 configured with GSSAPI and Kerberos set up and working. By working I mean I can bind and search when I have a ticket. My question is can I do a bind when I don't have a ticket? Can ...
Dave Barstis's user avatar
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60 views

SASL authorisation and hostname to access the server

I have a working postfix mail server. It is registered under two DNS names: mail.xxxx.de and xxxx.no-ip.org. I use SASL via dovecot for relay authorisation. It works flawless when the client uses the ...
EckartH's user avatar
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1 answer
879 views

535 5.7.8 Error: authentication failed: UGFzc3dvcmQ6

I have Postfix installed on a Fedora 38 box with the following: $ grep smtp_ main.cf smtp_sasl_auth_enable = yes smtp_sasl_type = cyrus smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd ...
ekkis's user avatar
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1 answer
499 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 ...
Tom Krebs's user avatar
1 vote
1 answer
90 views

NetBSD + openLDAP + SASL

I try to set up a connection to a openLDAP server running on NetBSD 10 via TLS and SASL. When I try ldapsreach -Y EXTERNAL I get ldapsearch: not compiled with SASL support and ldd /usr/bin/ldapsearch ...
Thomas P's user avatar
0 votes
1 answer
1k views

openLDAP / Sasl - ldap_sasl_interactive_bind_s: Local error (-2)

I configure openldap with sasl bind. Trying connect: # ldapsearch -v -H ldaps:// -Y PLAIN -U [email protected] But getting error: ldap_sasl_interactive_bind_s: Local error (-2) I create a config ...
Serhii's user avatar
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1 vote
1 answer
3k views

Fail2Ban - Posfix-SASL not working

i have a problem that my fail2ban will not ban sasl authentications against my postfix. This is an example log entry from /var/log/syslog: Jul 31 13:42:21 v50428 postfix/smtps/smtpd[635398]: warning: ...
nils50122's user avatar
1 vote
4 answers
856 views

Postfix with Dovecot on Ubuntu 20.04 postfix/mail fatal: no sasl authentication mechanisms

Here's the output of doveconf -n: # 2.3.7.2 (3c910f64b): /etc/dovecot/dovecot.conf # Pigeonhole version 0.5.7.2 () # OS: Linux 5.17.5-x86_64-linode154 x86_64 Ubuntu 20.04.4 LTS # Hostname: mail....
Scott K's user avatar
  • 11
2 votes
0 answers
297 views

Postfix SASL error: warning: unknown[xxx.xxx.xxx.xxx]: SASL LOGIN authentication failed: authentication failure

My use case is to use my own mail server to send emails from CCTV NVRs to overcome the daily limits imposed by GMail. The NVR has an option to setup authentication. The config worked for whitelisted ...
justanotherdev's user avatar
0 votes
1 answer
222 views

Postfix / Dovecot SASL authentication only working on primary domain

I have had a postfix server running flawlessly for three months now. Users log in to the server in their respective mail clients by connecting to mail.mydomain.com (with SSL) and there's never been ...
Doofitator's user avatar
0 votes
1 answer
1k views

Can PAM be used with Postfix and Dovecot SASL?

I have set up Postfix to use Dovecot SASL with PAM and Unix users, and Dovecot LDA (LMTP) for local mailbox storage. After some testing, turns out incoming mail gets declined with the reason: Error: ...
Marty Cagas's user avatar
1 vote
1 answer
689 views

How does SASL know to read config from /etc/postfix/sasl?

I've set up Postfix to authenticate with SASL on a Ubuntu based system. I've done this by following along with some recipes, but mostly readying a lot of the docs. One bit that works, but which I don'...
Dom's user avatar
  • 498
0 votes
1 answer
2k views

Postfix: reject_sender_login_mismatch not working

I want to use the following configuration for Postfix: smtpd_relay_restrictions = permit_mynetworks reject_sender_login_mismatch permit_sasl_authenticated defer_unauth_destination, ...
janeden's user avatar
  • 267
2 votes
1 answer
2k views

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 ...
Déjà vu's user avatar
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0 votes
2 answers
1k views

How does Sendmail figure out where SASL is listening?

I'm trying to get SMTP-AUTH working on a Mint Linux 20.2 machine, and I'm having trouble getting authentication to happen. I have installed Cyrus sasl2, and apparently configured it properly - ...
tsc_chazz's user avatar
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1 vote
0 answers
3k views

Postfix unable to authenticate with Microsoft Exchange (No credentials were supplied)

I want to setup postfix on my nagios server to relay emails to our Microsoft Exchange server and I am running into issues with authenticating with Microsoft Exchange. Specifically I am getting this ...
qroberts's user avatar
  • 285
0 votes
1 answer
2k views

postfix/sasl/pam (mysql) auth error

I've followed tutorial on http://flurdy.com/docs/postfix/ to set up an email server, and most of it works (after switching from Courier to Dovecot). Just not sending email through SMTP. Sending with ...
Rudie's user avatar
  • 347
1 vote
0 answers
378 views

Postfix Can't Receive Internet Email - warning: SASL: Connect to /var/spool/postfix/private/auth failed

Using CentOS 8, I've setup dovecot and postfix and tested that: I can sign in as an authenticated user Read email (IMAP) Send email to the same/different account on the server Send email outbound, to ...
dark_st3alth's user avatar
1 vote
1 answer
248 views

Trouble enabling mail_crypt in dovecot / SASL authentication failed

dovecot --version 2.3.4.1 (f79e8e7e4) Ok, I tried to enable mail-crypt but it's being weird. I'm using https://doc.dovecot.org/configuration_manual/mail_crypt_plugin/#ec-key. I ran: cd $HOME openssl ...
NorseGaud's user avatar
  • 151
3 votes
1 answer
4k views

Getting SENDMAIL (as a client) to use AUTH LOGIN

I am trying to use SENDMAIL (v8.15) on a Pi in my network to just forward mails to my SendGrid account. This is needed because my legacy webcams on my network cannot use the very long password ...
Old Geezer's user avatar
1 vote
2 answers
859 views

Dovecot not authenticating clients in mail server with postfix cyrus(for sasl authentication) and dovecot in centos 7

As I built a mailserver I have another question in process that I haven't been able to find in google so I am expecting I will get a answer here. The update is I created a mailserver with postfix ...
ram khanal's user avatar
0 votes
1 answer
354 views

mysql not authenticating with cyrus for postfix athentication

So i have been building a mail server and i have setted up postfix and a database now what i want is that cyrus should authenticate my users of mail server from a database i have setted up a database ...
ram khanal's user avatar
1 vote
4 answers
4k views

Postfix + sasldb issue (solved as of Mar 2021)

PS(SOLVED: Solution for Alpine Linux as of Mar 2021, the fix in cyrus-sasl 2.1.27-r12 is in edge branch. 3.13 only has cyrus-sasl 2.1.27-r10. PS: I know there are similar posts but they are very ...
John Siu's user avatar
  • 3,737
0 votes
1 answer
772 views

Postfix: How to malware & spam scan outgoing SMTP SASL auth users?

Although I have found two answers to this, I can't work out how to actually implement them, and at least one of them doesn't actually answer the question. So if anyone has any experience to share I'd ...
TommyPeanuts's user avatar
0 votes
1 answer
365 views

Postfix SASL authentication via Dovecot - Can I use the SASL login name in my postfix sql queries?

I have a mailserver with postfix, dovecot and mysql running on Debian buster. Everythings works fine so far, but I would like to setup a scenario where the login name for SASL auth is different from ...
Michael's user avatar
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0 votes
0 answers
390 views

Demanding SASL authentication on port 25 rejects all of my incomming email

I am using this chunk of code inside /etc/postfix/master.cf to force people to securely "subimt" email through port 465 which uses protocol SMTPS. SMTPS supports mandatory TLS which I use to ...
71GA's user avatar
  • 403
0 votes
2 answers
759 views

Postfix fails on incoming SMTP from remote MTAs for local delivery

I am transferring MTA to newer servers running Ubuntu 20.04 LTS. SMTPS is working well thus permitting clients to send mails after authentication. However, when sending mails from remote MTAs for ...
Thomas Urban's user avatar
3 votes
1 answer
3k views

configure saslauthd with PAM

I'm trying to configure saslauthd with PAM. I created a user test with password test using useradd and passwd and I checked that I can login with su - test. [arch@vps-5220ce87 ~]$ systemctl status ...
Labo's user avatar
  • 151
0 votes
1 answer
126 views

Using "postfix" user for "dovecot"

I set the Postfix so that my mailboxes (maildir format) for my virtual users are set like this: ┌───┐ │ # │ root > myserver > ~ └─┬─┘ └─> ls -l /var/mail/ total 4 drwxr-sr-x 5 postfix ...
71GA's user avatar
  • 403
0 votes
1 answer
715 views

OpenLDAP cn=config database access blocked

I use OpenLDAP 2.4.54 with Alpine. Here is my ldap configuration $ sudo slapcat -n0 dn: olcDatabase={-1}frontend,cn=config objectClass: olcDatabaseConfig objectClass: olcFrontendConfig olcDatabase: {-...
azmeuk's user avatar
  • 195
2 votes
1 answer
16k views

Why do I get "Server not found in Kerberos database" using testsaslauthd?

I'm trying to setup Kerberos auth over SASL using OpenLDAP. As I understand it, I need a host keytab in /etc/krb5.keytab from the KDC I'm using and then {SASL}user@realm in the given user's LDAP ...
Server Fault's user avatar
  • 3,794
0 votes
1 answer
685 views

Postfix + SASL SQLite gives auxprop error on CentOS 7

I am receiving an unknown password verifier(s) auxprop error when trying to use SQLite for SASL authentication in Postfix on CentOS 7. It seems that the SQLite SQL engine is not found. Contents of /...
tater's user avatar
  • 1,475
0 votes
2 answers
625 views

Can't determine the principal used to LDAP syncrepl GSSAPI

I've configured two openldap fully functional in HA (syncrepl mode provider - slave). After testing that simple bind syncrepl works flawlessly, I'm trying to deploy from scratch using only GSSAPI to ...
DG DM's user avatar
  • 35
1 vote
1 answer
13k views

Authenticating Apache HTTPServer 2.4.x with mod_auth_gssapi using Microsoft Active directory

I'm looking for below configurations for GSSAPI authentication with Apache 2.4 for Active directory: 1. How to configure Apache HTTPServer 2.4.x with mod_auth_gssapi using Microsoft Active directory? ...
Rohit Gaikwad's user avatar
0 votes
0 answers
843 views

Getting postfix to log to a file on docker

I have created a docker image based on Ubuntu 20.04 with postfix and dovecot. I also installed syslog-ng in hope to solve my problem, but it didn't work. Thing is, I want to use fail2ban to prevent ...
francisaugusto's user avatar
11 votes
2 answers
31k views

Postfix error, SASL authentication failed; cannot authenticate to server, no mechanism available

I would like to set up postfix relay to my website hosting SMTP server, from my home server. It's Centos 7, set up using dynamic IP and dynamic DNS. Because of limited space in my hosting site, I ...
Firman Azis Rauf's user avatar
7 votes
1 answer
3k views

Postfix warning: SASL: Connect to /var/spool/postfix/private/auth failed: No such file or directory

I have searched, and failed to find an answer and I am out of ideas. I just do not know enough about postfix and dovecot to parse the configs or understand what may be causing this error. warning: ...
Victor Major's user avatar
0 votes
1 answer
1k views

Dovecot: Username character disallowed by auth_username_chars: 0x0a

I'm trying to set up a postfix+dovecot server to use GNU Mailman for creating a mailing list server, however I'm currently stuck at setting up SASL authentication using dovecot. It seems to add a ...
user avatar
0 votes
1 answer
2k views

How to setup SASL Proxy Authorization with an OpenLDAP server on Debian

For Kerberos Authentication together with SASL/GSSAPI Authorization on client devices I need Proxy Authorization on an OpenLDAP server running on Raspberry Pi with Debian/Raspbian Buster. I tried to ...
Ingo's user avatar
  • 485

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