Sender must not open more than 500 simultaneous connections to inbound email servers without making prior arrangements.After multiple non-delivery responses (see #2), the sender must cease further attempts to send email to that recipient.After given a numeric SMTP error response code between 500 and 599 (also known as a permanent non-delivery response), the sender must not attempt to retransmit that message to that recipient.

Sender is expected to comply with all technical standards for the transmission of Internet email, as published by The Internet Society's Internet Engineering Task Force (IETF), including RFC 2821, RFC 2822, and others.

IMPORTANT: The server that hosts your mailbox may have junk email filtering settings that block messages before they reach your mailbox.In addition, email servers connecting to must adhere to the following requirements: Messages received from any email address or domain in your safe senders and recipients list are never sent to your Junk Email folder. Safe recipients are recipients that you don't want to block, usually groups that you’re a member of. Safe senders are people and domains you always want to receive email messages from. In addition to Safe Senders and Recipients and Blocked Senders, you can use this setting to treat all email as junk unless it comes from someone included in your Safe Senders and Recipients list. For more details, see Blocked senders.ĭon’t trust email unless it comes from someone in my Safe Senders and Recipients list or local senders Messages received from any email address or domain in your blocked senders list are sent directly to your Junk Email folder. For more details, see Safe senders and recipients.īlocked senders are domains and people you don't want to receive email messages from.

If you select this check box, email from any address in your contacts folders will be treated as safe. For more details, see Safe senders and recipients. Add senders you trust and recipients that you don't want to block to this list. Safe senders and recipients are domains and people whose email you don’t want diverted to your Junk Email folder. This filter is in addition to the junk email filter that’s been set by your administrator. Select this option if you want to use junk email filtering. Warning: If you select this option, email detected as spam by Exchange Online Protection will be delivered to your Inbox if the spam action set by your administrator is to move these messages to the Junk Email folder.

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