Authenticate your outgoing email - How to setup SPF records
If it's being blocked due to an SPF record, then ideally they need to mail server/ mail relay/spam filters) so it avoids the SPF check if required. You will be able to notify the sender in case of a delivery failure (e.g. due to an invalid Your server responds to each command with a 3- digit numeric code They generate Collateral_Spam, they require special attention for mail sent from .. SPF information is published as a TXT record in a domain's top-level DNS zone. I have two exchange servers ( & ) that send out to the internet with one But to some domains, I get the error, # failed to meet SPF requirements. Thanks. Tuesday, January 17, PM. Reply. |. Quote.
This is the likely cause if you can successfully send messages to other recipients in the same domain.
Error # failed to meet SPF requirements from some domains.
Ask the recipient to verify that your email address isn't on their block list. If it is on a block list, remove it.
Take out bad entries in the Auto-Complete List You may have selected an item from your Auto-Complete List that is no longer working correctly.
This list is also known as the nickname cache.Sender Policy Framework (SPF) Record
For example, the recipient may have been moved from an on-premises Exchange organization to Exchange Online or vice-versa. Although the recipient's email address is the same, other internal identifiers for the recipient may have changed, thus making your cached entry for that recipient invalid.
If you're using Outlook Web App To remove recipients from the auto-complete list in Outlook Web App, perform one of the following procedures.
- Max Euston
- Sending email
- Error 550 when verifying email address to be used with gmail
Remove a single recipient Choose New mail to start a new message. Start typing the recipient's name or email address until the recipient is displayed in the drop-down list.
The following procedure requires you to access your mailbox in the light version of Outlook Web App. To do this, open your mailbox in a web browser that only supports the light version of Outlook Web App, or use the following procedure: Remove all recipients Open your mailbox in Outlook Web App.
Log off and close your web browser.
Fix email delivery issues for error code in Office - Office
The next time you open your mailbox, you'll be using the light version of Outlook Web App. To empty the entire auto-complete cache, perform the following steps: Remove a single recipient Create a new email message.
If you've ever gotten a bounce message for an e-mail that you never sent, then you've been the victim of the second way. This can also cause all mail from your domain to be falsely treated as spam by some servers meaning that mail you send may get silently deleted.
When one mail server connects to another, the conversation goes something like this: The server identifies itself to us the '' line.
550 Failed to meet SPF requirements
First, we tell the server who we are but we will lie. The server does a reverse DNS lookup and shows our real name.
This is to a domain for which the server accepts mail. Recipient ok At this point, the mail server has accepted our request to send an e-mail, and we would now send the actual message, which would be delivered to the Recipient. This is an example of how e-mail and spam is sent.
This is easy to do, since SMTP was designed when the Internet was much smaller, and spam could be tracked back to the sender by IP address. Today, with so many home computers compromised by viruses, it isn't always the fault of the owner of that machine the spammer has taken control of the PC.