The name of your domain's email server is shown in the Apanel console: open Hosting management and read, in the Misc informations box on the left, the line E-mail SSL server name (POP3S / IMAPS / SMTPS). It only appears when the email service is active on the domain. The examples in this article use mail01.swisscenter.com, the SmarterMail email server; if your console shows another name, use the one from the console.
| Setting |
Value |
| Incoming server (IMAP) |
mail01.swisscenter.com |
| IMAP port |
993 |
| IMAP security |
SSL/TLS (Implicit TLS) |
| Outgoing server (SMTP) |
mail01.swisscenter.com |
| SMTP port |
465 (recommended), alternative: 587 with STARTTLS |
| SMTP security |
SSL/TLS on 465, or STARTTLS on 587 |
| Username |
Your full email address (e.g. prenom.nom@exemple.ch) |
| Password |
The mailbox's own (set when it was created, or changed from the console) |
| SMTP authentication |
Enabled, normal password |
Why port 465? Since RFC 8314 (2018), implicit TLS on port 465 is the recommended standard for SMTP submission: encryption is in place from the first byte, without a plaintext phase. Port 587 remains functional and compatible.
Your email software
Thunderbird
- Menu ☰ → Account Settings → Account Settings → Add Mail Account.
- Enter your name, your full email address and your password, then click Continue.
- Thunderbird attempts automatic detection. Click on Manual config.
- Fill in the fields as follows:
| Field |
Incoming server |
Outgoing server |
| Protocol |
IMAP |
SMTP |
| Hostname |
mail01.swisscenter.com |
mail01.swisscenter.com |
| Port |
993 |
465 |
| Connection security |
SSL/TLS |
SSL/TLS |
| Authentication method |
Normal password |
Normal password |
| Username |
Your full email address |
Your full email address |
Click on Re-test, then on Done.
Apple Mail (macOS)
- Open Mail → menu Mail → Add Account…
- Select Other Mail Account… then Continue.
- Enter your name, email address and password, then click Sign In.
- Mail displays "Unable to verify account name". This is normal: complete manually.
| Field |
Value |
| Account type |
IMAP |
| Incoming mail server |
mail01.swisscenter.com |
| Outgoing mail server |
mail01.swisscenter.com |
| Username |
Your full email address |
| Password |
Your password |
Click on Sign In, then select the apps to sync (Mail, Notes…).
Verify ports after creation
- Mail → Settings → Accounts → your account → tab Server Settings.
- Uncheck Automatically manage connection settings to be able to edit the ports.
- IMAP: port
993, TLS/SSL enabled, authentication Password.
- SMTP: port
465, TLS/SSL enabled, authentication Password.
- Save.
Mail (iPhone / iPad)
- Settings → Apps → Mail → Mail Accounts → Add Account.
On older iOS: Settings → Mail → Accounts → Add Account.
- Choose Other → Add Mail Account.
- Enter your name, your full email address, your password and a free description (e.g. "Work Mail").
- Tap Next, then select the IMAP tab at the top.
- Fill in both servers identically:
| Field |
Incoming and outgoing |
| Hostname |
mail01.swisscenter.com |
| Username |
Your full email address |
| Password |
Your password |
Tap Next: verification may take a minute.
Verify ports after creation
- Settings → Mail → Accounts → your account → tap the email address at the top.
- Incoming Mail Server: "Use SSL" enabled, port
993.
- Outgoing Mail Server (SMTP) → primary server: "Use SSL" enabled, port
465, authentication Password.
Microsoft Outlook
The steps below describe classic Outlook for Windows. For another version of Outlook, the values to enter are the same; the exact location of the fields is in Microsoft's documentation.
Classic Outlook for Windows
- Control Panel → Mail (Microsoft Outlook) → Email Accounts → New.
Or, from Outlook: File → Add Account.
- Check Manual setup or additional server types → Next.
- Choose POP or IMAP → Next.
- Fill in:
| Field |
Value |
| Your Name |
Free |
| Email Address |
Your full address |
| Account Type |
IMAP |
| Incoming mail server |
mail01.swisscenter.com |
| Outgoing mail server (SMTP) |
mail01.swisscenter.com |
| Username |
Your full email address |
| Password |
Your password |
- More Settings → tab Outgoing Server: check My outgoing server (SMTP) requires authentication and Use same settings as my incoming mail server.
- Tab Advanced: IMAP port
993 with SSL/TLS, SMTP port 465 with SSL/TLS.
- OK → Next: Outlook tests the connection, then Finish.
Outlook for Mac
- Outlook → Preferences → Accounts → + → New Account.
- Enter the email address → Continue, then choose IMAP.
- Incoming server:
mail01.swisscenter.com, port 993, SSL checked.
- Outgoing server:
mail01.swisscenter.com, port 465, SSL checked.
- Add Account.
eM Client
- Menu → Accounts → + Add Account.
- Select Mail → Other.
- Enter your email address → Next.
- eM Client attempts automatic detection. Click on Manual setup if necessary.
| Field |
IMAP tab |
SMTP tab |
| Host |
mail01.swisscenter.com |
mail01.swisscenter.com |
| Port |
993 |
465 |
| Security |
SSL/TLS |
SSL/TLS |
| Authentication |
Your full email address and your password |
Use these credentials (same as IMAP) |
Next, then enter your name and sending address → Finish.
Gmail App (Android)
The Gmail app can host other IMAP accounts than Google's.
- Open Gmail → tap your profile picture (top right) → Add another account.
- Choose Other.
- Enter your full email address → Next → Personal (IMAP).
- Enter your password → Next.
- Fill in the two server settings screens:
| Field |
Incoming server |
Outgoing server |
| Server |
mail01.swisscenter.com |
mail01.swisscenter.com |
| Port |
993 |
465 |
| Security type |
SSL/TLS |
SSL/TLS |
| Username |
Your full email address |
Your full email address |
| Sign-in required |
Not applicable |
Yes |
Finally choose the sync frequency → Next → Finish.
On some Android devices (Samsung, Xiaomi…), the native Email app works on the same principle: the server settings are identical.
Quick troubleshooting
| Symptom |
Probable cause |
Action |
| "Unable to verify certificate" |
TLS inspection by a corporate firewall, or system clock offset |
Check the device's date and time; on a corporate network, contact the administrator |
| Receiving works, sending fails |
SMTP authentication not enabled, or port 465 blocked outbound |
Check that SMTP authentication is enabled with the same credentials as IMAP. On a restricted network (hotel, hotspot), switch to 587 with STARTTLS |
| Password rejected |
Typo, or password changed without updating the device |
Re-enter the password; check that the username is indeed the full email address |
| Very slow or expired connection |
Port 465 blocked by the network |
Try port 587 with STARTTLS |
Frequently asked questions
Is port 465 not obsolete?
No. It was briefly discouraged in the late 1990s, but RFC 8314 (January 2018) officially rehabilitated it under the name submissions, and now recommends it as a priority over STARTTLS on 587. Many online documentations have not been updated.
What is the concrete difference between 465 and 587?
- 465 (Implicit TLS): encryption starts from the first byte: no plaintext phase, no risk of downgrade.
- 587 (STARTTLS): the connection opens in plaintext, then upgrades to TLS. Slightly more exposed to downgrade attacks if the client is misconfigured.
Both ports remain functional and compliant. 465 is our default recommendation; 587 remains available for older clients or networks that block it.
And POP3?
Available if necessary: mail01.swisscenter.com, port 995, SSL/TLS. Reserve this for cases where you check your mail from a single device. For multi-device usage, use IMAP.
