Server Fault Stack Exchange
Server Fault Stack Exchange

Questions tagged [imap]

IMAP stands for Internet Message Access Protocol and is the other e-mail protocol along with POP.

E-mail clients using IMAP often leave messages on the server until the user deletes them. This allows multiple clients to manage the same mailbox - useful for support help desks for example.

IMAP is just one communications protocol on the web. Others include:

  • Transmission Control Protocol (TCP)
  • User Datagram Protocol (UDP)
  • Internet Control Message Protocol (ICMP)
  • Hypertext Transfer Protocol (HTTP)
  • Post Office Protocol (POP3)
  • File Transfer Protocol (FTP)

IMAP on Wikipedia

603 questions
0
votes
1 answer

Does email client connect to IMAP/SMTP server by resolving IP through A record or MX record?

With my limited understanding, I understand when an SMTP server sending email out, it resolves the MX record to get to the destination email server. But what about when you setup an email account on an email client? When you provide the "host" (e.g.…
Nick Li
  • 103
  • 2
0
votes
1 answer

How to configure Exim4 to relay emails from authenticated users in various locations

I have a Debian cloud server with Exim4 running and serving emails with DMARC, SPF, and DKIM properly set up. I can ssh into the server and send and receive encrypted emails successfully. Dovecot is running on the server and allows clients to…
Jeff12
  • 3
  • 1
0
votes
0 answers

How to permit only certain e-mail clients for IMAP access

My company is giving out new Android smartphones to employees, and they should be able to manage their e-mail on them. Currently, only access via webmail is enabled, but the mobile webmail client (Zimbra) is awkward and very feature-limited.…
Ben Opp
  • 247
  • 4
  • 12
0
votes
0 answers

Bizarre intermittent, but long lasting failure to connect to just one server

I have a bizarre connection issue with just one server that I have no idea how to diagnose. Basically I'm setting up a self-hosted email service using iRedMail and everything works fine for a while and then: all http, https and imap connections…
Brad Robinson
  • 101
  • 1
0
votes
1 answer

How to create failregex to block imap-logins fail2ban

Could someone help me with creating correct fail2ban filter. Bad ip addresses knocking port 993 /etc/fail2ban/filter.d/dovecot.conf doesn't catch such log I found something like this, but i get errors with this [Definition] failregex =…
kusjev
  • 1
0
votes
1 answer

Is it possible to trigger a shell script on incoming emails, can it be done without services like dovecot, postix, etc?

This question more is for learning purpose. I'm exploring ways to develop a small email server (in + out). I have a domain that points to my server as well as mx records and all that stuff... I also have the open ports 25, 26, 110, 993, 995, 143,…
Jintor
  • 139
  • 7
0
votes
1 answer

manual certificate authentication for IMAPS

I'm running an IMAPS service and users are authenticated with an X.509 certificate. It works fine using Thunderbird. But how I can connect to the IMAPS service manually using openssl? I use the same certificate with openssl s_client than in…
Micha
  • 101
  • 2
0
votes
1 answer

Share Postfix IMAP Calenders

We are currently running a dovecot mailserver(maildir) and postfix. - Ubuntu 18.04.6 LTS (Bionic Beaver) Our new COO wants to sync his contacts and calendar with outlook(MAC) and iOS(iPhone) using our service. Is there a way we can achieve this.
ragnarlod
  • 1
0
votes
1 answer

does SSL/TLS STARTLS full encrypt connexion for POP and IMAP

I am configuring POP and IMAP accounts in thunderbird mail client. Here are 2 options: Security: None SSL/TLS STARTLS Authentication method: Normal password Encrypted password Kerberos / GSSAPI NTLM OAuth2 I have 2 mails accounts: One POP and…
Bob5421
  • 319
  • 3
  • 8
  • 16
0
votes
1 answer

How to proxy IMAP/POP3 connection to appropriate backend mail server by domain

I have system with multiple email server (exchange, zimbra) for multiple domain. So when users of domain A want connect to server for getting email they have to use IP of server A (Ex: 192.168.10.253), same way with user of domain B, they have to…
Khoa Le Anh
  • 1
  • 2
0
votes
1 answer

How to stop OS/daemon information leakage in dovecot (server_tokens)?

How do I stop dovecot from telling its clients what flavour of linux I'm running and that it's a dovecot imap server? If I connect to my smtp server, I see the following snippet user@host:~$ openssl s_client -crlf -connect…
Michael Altfield
  • 739
  • 2
  • 8
  • 23
0
votes
1 answer

Access POP3 content from other computer

I have a tough mission, that I have no idea how to accompish it. In our company, all the e-mail accounts are configured as IMAP accounts, therefore we can access the e-mail from wherever. However, there are 2 e-mail accounts configured as POP3…
questionador
  • 11
  • 5
0
votes
1 answer

Incoming external email appeared in Postfix log, but not in mailbox

I setup Postfix + Dovecot (with IMAP) for my Ubuntu 16.04 email server. I sent an email from Gmail to my domain, I can see the postfix log "reacts" with the incoming email, but the incoming email does not appear in the Mailbox. Here are the related…
Raptor
  • 1,001
  • 4
  • 19
  • 38
0
votes
1 answer

Postfix dovecot unable to authenticate

I use to work with postfix/sasl/courrier-auth on Gentoo for years. I just migrated to Debian 10 postfix/dovecot. I'm unable to make it work : Send mail ok, TLS ok. But unable to authenticate (SMTP 587, IMAP 993). I'm not familiar with dovecot and I…
user625434
  • 11
  • 1
0
votes
0 answers

dovecot: imap-login: Aborted login (auth failed, 2 attempts in 2 secs) - usually working - perhaps timeout issue? Debug options?

I have a mail server with a few dozen IMAP accounts. The configuration is correct for each account, every one of them tests OK. When a client from a particular, very slow Internet connection attempts to connect, I get messages like these: Mar 14…
Ned64
  • 303
  • 1
  • 3
  • 12
1 2 3
…
40 41