If a firewall or your Internet Service Provider (ISP) blocks the 587 port, an alternate SMTP port 465 with SSL encryption type can be used.On the Add your email address screen, enter your email address and tap Next. Alternate SMTP ports 587 or 465 are recommended. Find the section for Accounts and tap on it.

They are doing this to cut down the amount of spam that is sent from their network.

Many Internet Service Providers (ISPs) are blocking the default SMTP port 25, which is the port used to send email messages.

Important Notes for alternate SMTP ports:

Set up your OX Sync or Collaborate mailbox using ActiveSync on Android Mobile Device (Phones, Tablets).

Configure Android Devices (Phones, Tablets).

To set up iCloud email on Android, use the Outlook application. You can find these settings in the app drawer of your Android device.

Set up your OX Sync or Collaborate mailbox using ActiveSync on iOS Mobile Device (iPhone, iPad) Once you’ve done this, you’ll need to set up a separate application password so you can sync your iCloud email with Gmail or any other email client.

The linked articles below contain instructions on how to set up your Open-Xchange mailbox as POP or IMAP account on various email clients for Windows and Mac. Note: You can also access your email via the Open-Xchange Webmail interface at.

In this help article you will find general instructions and settings on how to configure your Open-Xchange (POP/IMAP) mailbox in the most popular email clients and mobile devices.

Setting up mac mail on android device