You need these values to set up your mailbox in an email program — Thunderbird, Apple Mail, Outlook in IMAP mode or any other client.
Credentials
| Field | Value |
|---|---|
| Username | Your full email address, e.g. max.mustermann@musterfirma.at |
| Password | The mailbox password |
| Incoming and outgoing mail server | zimbra.mydc.at |
The two most common mistakes: only the part before the @ as the username — and your own domain as the server name. Our certificate is issued exclusively for zimbra.mydc.at; with any other name your program reports a certificate error.
Ports
| Purpose | Protocol | Port | Encryption |
|---|---|---|---|
| Incoming mail | IMAP | 993 | SSL/TLS — recommended |
| IMAP | 143 | STARTTLS | |
| POP3 | 995 | SSL/TLS | |
| Outgoing mail | SMTP | 587 | STARTTLS — recommended |
| SMTP | 465 | SSL/TLS |
Outgoing mail always requires authentication with the same credentials — enable “Server requires authentication” or something comparable. Unencrypted connections are not possible; POP3 on port 110 is closed.
IMAP or POP3?
Use IMAP. Folder structure, read status and sent messages stay the same on all devices, and everything is included in our backup. POP3 fetches the messages onto your device and, depending on the setting, deletes them from the server — after that they are only held locally on your device and no longer in our backup.
Message size
A message may be up to 150 MB in size, including attachments. Attachments grow by about a third when they are sent — so a 100 MB file comes close to the limit. The receiving end may have a lower limit.
Notes on individual programs
- Thunderbird
- Set the authentication method for incoming and outgoing mail to “Normal password”. Automatic detection occasionally suggests OAuth2 — sign-in then fails.
- Apple Mail, iOS, Android
- For calendar and contacts, ActiveSync is the better way.
- Outlook
- Over IMAP, Outlook synchronizes email only. For the full feature set: Outlook on Windows.
If the connection fails
- Sign-in is rejected
- Did you enter the full email address as the username? You set a new password under E-Mail Accounts.
- Receiving works, sending does not
- In most cases, authentication for the outgoing mail server is missing, or port 25 is entered instead of 587.
