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Use the following settings to configure any desktop or mobile email client (Outlook, Thunderbird, Apple Mail, iOS Mail, Gmail app, etc.) with your Open-Xchange mailbox. These settings are also available in the customer portal under Manage Email Accounts → Email Client Settings.

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Server Settings

SettingValue
Incoming Server (IMAP)imap.us.appsuite.cloud
IMAP Port993 (SSL/TLS)
Incoming Server (POP3)pop.us.appsuite.cloud
POP3 Port995 (SSL/TLS)
Outgoing Server (SMTP)smtp.us.appsuite.cloud
SMTP Port465 (SSL/TLS)
UsernameYour full email address (e.g., user@example.com)
PasswordYour email account password
AuthenticationRequired for IMAP, POP3, and SMTP

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IMAP vs. POP3

IMAPPOP3
Sync across devicesYes — read, deleted, and moved messages sync everywhereNo — changes on one device do not reflect on others
Email stays on serverYesNo — email is downloaded and removed from the server
RecommendedYes, for most usersOnly if you need offline-only access on a single device

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Encryption

Always use SSL/TLS encryption. The server settings above all use encrypted connections by default. Do not use unencrypted connections or non-standard ports.