Based on our record, iRedMail should be more popular than NethServer. It has been mentiond 2 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
For photo I use Immich. For contact and calendar I use my own mail server (iRedMail). For Cloud I have my own nextcloud server. With nextcloud you can sync contact and calendar of uou don't have a mail server likes iRedMail. Source: 10 months ago
I used to spend all my time maintaining e-mail quirks for my server. Adjust this, updated that, fix this breakage, yada yada. But then I decided to setup iRedMail which uses postfix, dovecot, certbot, roundcube, spamassasin, mariadb, ldap and all the bells and whistles. All I have to do now is make sure I don’t break it doing any software upgrades on freebsd. 10/10 scores after configuring and blacklist free. Source: almost 2 years ago
Check out Nethserver - https://nethserver.org/. Source: over 2 years ago
Zimbra - Zimbra is trusted by over 500 million users to increase productivity with a complete set of collaboration tools while maintaining total control over security and privacy.
Zentyal - Linux directory, domain, mail, gateway and infrastructure server for SMBs.
mailcow - An open source mailserver suite.
ClearOS - A very good alternative for Windows Server, for free
Roundcube - Web-based IMAP email client
pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more