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https://bobcares.com/blog/550-is-not-allowed-to-send-mail-from/
Error "550 is not allowed to send mail from" is caused when the sender's IP is not present in SPF records. Here are 3 cases it can happen how to fix them.
https://www.axigen.com/forum/forum/support-discussion-lists/general-configuration/23763-550-delivery-not-allowed-error-when-sending-emails-to-external-domain
For example I could not understand what means 'our external domain'? If you are sending an email from Axigen to an external server and this last one reject it with '550 - delivery not allowed' than you have to find why that particular external server is not able to deliver …
https://bobcares.com/blog/550-email-blocked/
Sep 29, 2018 · In our customer’s servers we setup firewalls to block such direct SMTP connections, and force all scripts to send mails through the mail server. This helps us monitor per user email volume, and take action if something seems suspicious. 2. Limit the number of emails allowed per hour. Most email users send only less than 50 mails an hour.
https://support.office.com/en-gb/article/I-receive-a-550-553-or-relay-prohibited-error-when-sending-email-messages-65b494a4-0a15-433e-829f-e73651e0245e
You send an email message to another person whose email address also ends with @proseware.com. No. Your mail should be processed normally. Same as the first scenario, except that you send an email message to a person whose email address ends with @adatum.com. Yes, but it is not blocked.
https://answers.microsoft.com/en-us/outlook_com/forum/oemail-osend/smtp-error-code-550-sc-002/03fa52b5-fe59-430e-9cd9-bc7e31087fd8
Mar 25, 2014 · Tech support scams are an industry-wide issue where scammers trick you into paying for unnecessary technical support services. You can help protect yourself from scammers by verifying that the contact is a Microsoft Agent or Microsoft Employee and that the phone number is an official Microsoft global customer service number.
https://answers.microsoft.com/en-us/msoffice/forum/all/550-50350-remote-server-returned-an-error-550/801d4010-d8c2-43d4-bd20-8ff2c18262a7
Oct 02, 2017 · Tech support scams are an industry-wide issue where scammers trick you into paying for unnecessary technical support services. You can help protect yourself from scammers by verifying that the contact is a Microsoft Agent or Microsoft Employee and that the phone number is an official Microsoft global customer service number.
https://support.3dcart.com/Knowledgebase/Article/View/2/1/can-not-send-email-using-outlook-error-550-not-local-host-not-a-gateway
If you do not want to use your ISPs server for SMTP, and the ISP is blocking port 25, you can switch the port to 587 for your outgoing mail and use mail.yourdomain.com for the SMTP server name. This article is specific to users of 3dcart Shopping Cart Software.
https://www.godaddy.com/community/Managing-Email/Email-Problem-Error-550-5-1-1/td-p/10862
i have made domian and then take hosting backge, economy hosting pakge then i created emails, the probelm is, I can login to my email and send but i cant recive any eamil the sender get this message RECIPIENT FAILED PERMANENTLY TECHNICAL DETAILS OF PERMANENT FAILURE ERROR RETUREND WAS 550 5.1.1 ...
https://support.smtp2go.com/hc/en-gb/sections/205104727-Email-Delivery
Email Delivery. Tips to maximize your email deliverability and stay out of blacklists or spam folders. ★ Sender Domains "Domain of sender address does not exist" error; Barracuda Delivery Solution; Error: 550 that SMTP username's account is not allowed to send; Enabling or Disabling Delivery Status Notifications (DSN) in Outlook
http://d2w67tjf43xwdp.cloudfront.net/Classroom/Send/How_Emails_Are_Sent/unauthenticated_sender.html
550 Unauthenticated Senders Not Allowed View and Edit If you’re getting an “Unauthenticated Senders Not Allowed” error, the problem usually lies in authenticating with our SMTP server.
https://portal.smartertools.com/community/a86442/MasterPages/MasterPages/
Interestingly, I found that this issue was narrowed to a single user account. Other user accounts would send just fine. But if this particular user account tried to send anything, they received the undeliverable "550 Outgoing SMTP is not allowed".
https://community.spiceworks.com/topic/666074-spf-error-you-don-t-have-permission-to-send-from-this-domain-your-ip-address
Dec 01, 2014 · SPF ERROR: You don't have permission to send from this domain. Your IP address ... I use my emails without emails but there are some that return (mail delivery failed). ... SPF ERROR: You don't have permission to send from this domain. Your IP address is not allowed.
https://www.youtube.com/watch?v=5ca6FnLygK4
Feb 18, 2014 · How to fix Server error: '550 Authentication is required for relay'
https://www.experts-exchange.com/questions/22050259/URGENT-Unable-to-Send-mail-message-550-Open-relay-not-allowed.html
Find answers to URGENT! Unable to Send mail - message 550 Open relay not allowed from the expert community at Experts Exchange
https://sendgrid.com/docs/for-developers/sending-email/smtp-errors-and-troubleshooting/
550 `Requested action not taken: mailbox unavailable` The user’s mailbox was unavailable. Usually because it could not be found, or because of incoming policy reasons. Remove these address from your list - it is likely a fake, or it was mistyped. 551 `User does not exist.` The intended mailbox does not exist on this recipient server.
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