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SMTP Error 471

Resolving the Error – Solution To fix SMTP error 471, ensure your email avoids spam-associated phrases. If the problem persists, temporarily disable your security software to check if it’s causing the block. If so, adjust its settings for fewer restrictions. If the issue is with a remote server, contact your SMTP service provider for assistance.
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Error 515: Destination Mailbox Address Invalid

Resolving the Error – Solution To resolve Error 515, start by double-checking the recipient’s email address for any mistyped characters or other inaccuracies. If the email address appears correct, it’s possible the account may have been deactivated or deleted, or the domain might no longer be active. If the issue persists, consider contacting the intended […]
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Error 522: Recipient Has Exceeded Mailbox Limit

Resolving the Error – Solution To resolve Error 522, the recipient must take action to manage their mailbox storage. This can involve deleting old or unnecessary emails, especially those with large attachments, to free up space. Archiving important emails to an external storage solution can also help. Additionally, the recipient may consider contacting their email […]
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Error 531: Mail System Full

Resolving the Error – Solution To address Error 531, the recipients or their email system administrators need to take action to free up space within the mail system. This can involve deleting old or unnecessary emails, archiving important emails to an external storage solution, or increasing the storage capacity of the mail server. For individual […]
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SMTP Error 447

Resolving the Error – Solution To avoid SMTP Error 447, familiarize yourself with your SMTP server’s recipient limits and ensure your emails comply with these guidelines. For instance, if your server permits only 30 recipients per email, ensure to include no more than this number across the “To,” “CC,” and “BCC” fields. If you need […]
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Error 431: Insufficient Storage

Resolving the Error – Solution To resolve this error, the recipient needs to take action to free up space in their mailbox. This can involve deleting old or unnecessary emails, compressing large attachments, or archiving emails to an external storage solution. On the server side, administrators may need to increase storage capacity or manage resources […]
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SMTP Error 547

Resolving the Error – Solution To address this error, verify the accessibility of the recipient’s email server and confirm it’s currently accepting emails. Additionally, check that both the IP address and domain of the sending server are not listed on any blocklists, either public or private, which could prevent successful email delivery.
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SMTP Error: Port 456

Resolving the Error – Solution To solve this issue, switch to using port “587” or “2525” for making SMTP connections with TLS. Port “2525” should be considered an alternative only if port 587 is inaccessible and your SMTP server supports connections on this port.
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SMTP Error 453

Resolving the Error – Solution To resolve this error, initially, it’s often effective to simply wait a bit and then try resending the email, as the server issue may be temporary. It’s also important to check the SMTP settings in your email client, ensuring that ports, authentication details, and MX records are correctly configured. If […]
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SMTP Error 441

Resolving the Error – Solution To resolve this error, several steps may be necessary. Initially, contacting the administrators of the recipient’s SMTP server is a good start. They can assist in verifying if you are using the correct SMTP port and the appropriate authentication type. If the issue stems from your network, such as a […]
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SMTP Error 556: Message Too Large

Resolving the Error – Solution To fix this error, it’s important to make sure your email, including any attachments, does not surpass the size restrictions of the recipient’s email server. If the email or attachment is too big, try dividing the attachment into smaller segments, or use compression techniques to reduce their size. Adhering to […]
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SMTP Error 517

Resolving the Error – Solution To fix this error, contact the recipient’s email support to understand and resolve the block. Ensure compliance with email best practices and anti-spam laws. If blacklisted, seek removal from these lists. Regularly review email content for any elements that might appear suspicious or deceptive, and familiarize yourself with the recipient […]
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Error 405: Method Not Allowed

Resolving the Error – Solution To address this error, confirm that your request method (GET, POST, PUT, DELETE, etc.) aligns with what the server supports for that resource. Check the API or web service documentation to verify the correct method. For web developers, ensure that website forms or AJAX requests match server configurations. If using […]
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Error 504: Command Parameter Not Implemented

Resolving the Error – Solution To address this error, review the SMTP command parameters of the failed email and adjust them to match the recipient’s MTA configuration. Alternatively, reconfigure the MTA to accept those parameters, or resend the email without the problematic command. If it’s a timeout issue, try sending the email later when server […]
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Error 553: Requested Action Not Taken

Resolving the Error – Solution To address this error, start by double-checking the recipient’s email address for any typos or misspellings. Ensure the domain is correct and active. If the address is accurate, verify that your IP address or email isn’t blocklisted. We also recommend reviewing the content of your email, ensuring it doesn’t have […]
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Error 552: Requested Mail Action Aborted

Resolving the Error – Solution To address this error, verify the size limits and permitted attachment types set by the recipient’s email server or service provider. Ensure that the email, including attachments, remains within the specified size constraints. Additionally, it’s crucial to only send attachments in file formats that are accepted by the recipient’s server […]
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Error 541: The Recipient Address Rejected Your Message

Resolving the Error – Solution To address this error, ensure your email content doesn’t resemble spam. Spam filters frequently use patterns to identify suspicious emails, so tweaking content can help bypass these filters. If the error persists, evaluate the standing of your email server’s IP address by checking if your IP has been blocklisted; if […]
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Error 503: Bad Sequence of Commands

Resolving the Error – Solution To address this error, users should first check and ensure that their email client’s SMTP authentication settings are correctly configured. This typically involves confirming that the correct username and password are entered. If you’re unsure about the right settings, consulting the email service provider’s documentation or contacting their support team […]
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Error 521: Server Does Not Accept Mail

Resolving the Error – Solution Before attempting to fix this error, it’s crucial to first verify the actual delivery status of the emails sent. There’s a chance the emails have been successfully relayed further and delivered to the intended recipients. If, however, recipients confirm they haven’t received the emails, the next step is pinpointing the […]
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Error 421: Service Not Available, Closing Transmission Channel

Resolving the Error – Solution The initial step to fix this error is typically to wait and retry sending the email at a later time since the issue is often temporary. If the error arises after resending the email at a later time, it’s advisable to ensure that your email client or application is not […]