Share via

Email Delivery Failure

Jhamaima Namata 20 Reputation points
2026-06-01T12:30:17.7866667+00:00

(******@outlook.com)

A communication failure occurred during the delivery of this message. Please try to resend the message later. If the problem continues, contact your email admin. please help me figure this out thanks

Outlook | Web | Outlook.com | Email
0 comments

Answer accepted by question author

AI answer

2026-06-01T12:30:35.6466667+00:00

The error indicates a temporary communication problem between Outlook.com and the recipient’s email server. This is one of the common “can’t connect to remote server,” “connection timed out,” or similar delivery-failure conditions.

Use these steps:

  1. Wait and resend the message
    • Many of these errors fix themselves over time when the receiving server becomes available again.
    • Wait a short time (for example, 15–30 minutes) and resend the email.
    • If the error message says the recipient’s email provider will keep trying to deliver your message, no action is needed; the provider will retry automatically.
  2. Verify the recipient’s email address
    • Make sure the address in the To field is correct and has no typos.
    • If the error mentions “host unknown,” “domain lookup failed,” or similar, confirm with the recipient that their domain (the part after @) is still valid and hasn’t changed.
  3. Check for mailbox-related issues on the recipient side
    • If the error text mentions “mailbox full,” “mailbox not found,” “invalid mailbox,” or “user unknown,” the problem is on the recipient’s side (full mailbox, changed address, or removed account).
    • If possible, contact the recipient another way (phone, chat, etc.) so they can clear space or give an updated address.
  4. Try sending from Outlook.com web
    • If the failure happens when using another email app, sign in directly to Outlook.com and send the same message from there to see if it succeeds.
  5. If the problem continues
    • If messages to multiple recipients keep failing with similar “communication failure” errors, there may be a broader issue with the receiving servers or with how those servers treat Outlook.com mail.
    • Use the in-product Help in Outlook.com (menu bar → Help) and describe the delivery failure. If self-help does not resolve it, choose Still need help? to contact support.

References:

AI-generated content may be incorrect. Read our transparency notes for more information.

Was this answer helpful?

1 person found this answer helpful.

0 additional answers

Sort by: Most helpful
Most helpful Newest Oldest

Your answer

Answers can be marked as 'Accepted' by the question author and 'Recommended' by moderators, which helps users know the answer solved the author's problem.