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troubleshooting: add Fail2ban IMAP self-ban article

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Documents the 2026-03-14 incident where MajorAir's public IP was banned
by the postfix-sasl jail after repeated SASL auth failures, silently
blocking all IMAP connections from Spark Desktop.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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majorlinux
2026-03-14 21:57:01 -04:00
parent 66fcca8028
commit 1d8be8669e
6 changed files with 319 additions and 66 deletions
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* [Home](index.md)
* [Linux & Sysadmin](01-linux/index.md)
* [Introduction](01-linux/index.md)
* [Self-Hosting](02-selfhosting/index.md)
* [Introduction](02-selfhosting/index.md)
* [Streaming](04-streaming/index.md)
* [Introduction](04-streaming/index.md)
* [Troubleshooting](05-troubleshooting/index.md)
* [ISP SNI Filtering & Caddy](05-troubleshooting/isp-sni-filtering-caddy.md)
* [Docker & Caddy Recovery After Reboot (Fedora + SELinux)](05-troubleshooting/docker-caddy-selinux-post-reboot-recovery.md)
* [Home](index.md)
* [Linux & Sysadmin](01-linux/index.md)
* [Linux File Permissions](01-linux/files-permissions/linux-file-permissions.md)
* [Managing Linux Services with systemd](01-linux/process-management/managing-linux-services-systemd-ansible.md)
* [SSH Config & Key Management](01-linux/networking/ssh-config-key-management.md)
* [Package Management Reference](01-linux/packages/package-management-reference.md)
* [Ansible Getting Started](01-linux/shell-scripting/ansible-getting-started.md)
* [Bash Scripting Patterns](01-linux/shell-scripting/bash-scripting-patterns.md)
* [SnapRAID & MergerFS Storage Setup](01-linux/storage/snapraid-mergerfs-setup.md)
* [Linux Distro Guide for Beginners](01-linux/distro-specific/linux-distro-guide-beginners.md)
* [WSL2 Instance Migration to Fedora 43](01-linux/distro-specific/wsl2-instance-migration-fedora43.md)
* [Self-Hosting & Homelab](02-selfhosting/index.md)
* [Self-Hosting Starter Guide](02-selfhosting/docker/self-hosting-starter-guide.md)
* [Docker vs VMs for the Homelab](02-selfhosting/docker/docker-vs-vms-homelab.md)
* [Debugging Broken Docker Containers](02-selfhosting/docker/debugging-broken-docker-containers.md)
* [Setting Up Caddy as a Reverse Proxy](02-selfhosting/reverse-proxy/setting-up-caddy-reverse-proxy.md)
* [Tailscale for Homelab Remote Access](02-selfhosting/dns-networking/tailscale-homelab-remote-access.md)
* [rsync Backup Patterns](02-selfhosting/storage-backup/rsync-backup-patterns.md)
* [Tuning Netdata Web Log Alerts](02-selfhosting/monitoring/tuning-netdata-web-log-alerts.md)
* [Linux Server Hardening Checklist](02-selfhosting/security/linux-server-hardening-checklist.md)
* [Open Source & Alternatives](03-opensource/index.md)
* [SearXNG: Private Self-Hosted Search](03-opensource/alternatives/searxng.md)
* [FreshRSS: Self-Hosted RSS Reader](03-opensource/alternatives/freshrss.md)
* [Gitea: Self-Hosted Git](03-opensource/alternatives/gitea.md)
* [rmlint: Duplicate File Scanning](03-opensource/productivity/rmlint-duplicate-scanning.md)
* [tmux: Persistent Terminal Sessions](03-opensource/dev-tools/tmux.md)
* [screen: Simple Persistent Sessions](03-opensource/dev-tools/screen.md)
* [rsync: Fast, Resumable File Transfers](03-opensource/dev-tools/rsync.md)
* [Vaultwarden: Self-Hosted Password Manager](03-opensource/privacy-security/vaultwarden.md)
* [yt-dlp: Video Downloading](03-opensource/media-creative/yt-dlp.md)
* [Streaming & Podcasting](04-streaming/index.md)
* [OBS Studio Setup & Encoding](04-streaming/obs/obs-studio-setup-encoding.md)
* [Troubleshooting](05-troubleshooting/index.md)
* [Apache Outage: Fail2ban Self-Ban + Missing iptables Rules](05-troubleshooting/networking/fail2ban-self-ban-apache-outage.md)
* [Mail Client Stops Receiving: Fail2ban IMAP Self-Ban](05-troubleshooting/networking/fail2ban-imap-self-ban-mail-client.md)
* [Docker & Caddy Recovery After Reboot (Fedora + SELinux)](05-troubleshooting/docker-caddy-selinux-post-reboot-recovery.md)
* [ISP SNI Filtering with Caddy](05-troubleshooting/isp-sni-filtering-caddy.md)
* [Obsidian Vault Recovery — Loading Cache Hang](05-troubleshooting/obsidian-cache-hang-recovery.md)
* [Qwen2.5-14B OOM on RTX 3080 Ti (12GB)](05-troubleshooting/gpu-display/qwen-14b-oom-3080ti.md)
* [yt-dlp YouTube JS Challenge Fix on Fedora](05-troubleshooting/yt-dlp-fedora-js-challenge.md)
* [Gemini CLI Manual Update](05-troubleshooting/gemini-cli-manual-update.md)
* [MajorWiki Setup & Publishing Pipeline](05-troubleshooting/majwiki-setup-and-pipeline.md)