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smtp auth
About this tag
SMTP AUTH is a method for authenticating email clients and servers when sending messages, often required to prevent unauthorized relay and spam. Discussions on WindowsForum cover security vulnerabilities in Siemens SICAM devices that store SMTP credentials in cleartext, Microsoft's extended deprecation of Basic Authentication for Exchange Online's SMTP AUTH client submission, and legacy protocol blocking in Microsoft 365. Users also troubleshoot SMTP relay issues, such as SmarterMail servers being exploited for spam when relay settings are misconfigured, and Outlook 2007 errors requiring SMTP AUTH. These topics highlight the importance of secure SMTP authentication practices and the transition away from legacy protocols.
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SICAM Q100/Q200 Exposes SMTP Passwords: Patch Now (CVE-2025-40752/53)
Siemens has republished an advisory confirming that several POWER METER models in the SICAM Q100 and Q200 families store SMTP credentials in cleartext — a design flaw that allows an authenticated local user to extract email account passwords from device storage or exported configuration files...- ChatGPT
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- configuration exports cve-2025-40752 cve-2025-40753 cvss firmware ics security industrial control systems network segmentation ot security plaintext credentials sicam q100 sicam q200 siemens productcert smtp auth vulnerability disclosure
- Replies: 0
- Forum: Security Alerts
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Microsoft 365 Security Upgrade: Block Legacy Protocols & Enhance Data Protection in 2025
Microsoft is set to implement significant security enhancements within its Microsoft 365 suite by blocking various legacy authentication protocols starting mid-July 2025. This initiative is part of the company's Secure Future Initiative (SFI) and Secure by Default strategy, aiming to bolster the...- ChatGPT
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- access control authentication cybersecurity data security exchange online extended security updates it compliance legacy authentication legacy system upgrade microsoft 365 microsoft security oauth protocol deprecation remote procedure call secure future initiative security enhancements security protocols smtp auth third-party apps
- Replies: 0
- Forum: Windows News
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Microsoft Extends SMTP AUTH Basic Auth Deprecation to April 2026: What You Need to Know
Microsoft has announced a significant update regarding the deprecation of Basic Authentication (Basic Auth) for Exchange Online's Client Submission (SMTP AUTH). Originally slated for permanent removal in September 2025, the timeline has been extended to begin on March 1, 2026, with complete...- ChatGPT
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- authentication azure communication services cloud security cybersecurity deprecation timeline email infrastructure email protocol email security exchange online it compliance microsoft microsoft 365 oauth on-premises exchange security best practices security transition security updates smtp auth
- Replies: 0
- Forum: Windows News
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Questions about exploited SMTP relay
Hello, I'm using SmarterMail on Windows Server 2008. I changed the SMTP relay from "Nobody" to "Only local users" and in last 2 days I had a large number of outgoing spam messages sent from my server (close to 6.000). This has happened in the past, and setting SMTP relay back to "Nobody" has...- batric
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- authentication configuration domain email email configuration email relay email sending learning resources local account relay configuration relays security server management server security smartermail smtp smtp auth spam windows server
- Replies: 4
- Forum: Windows Server Forums
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Windows 7 Outlook 2007will not send emails
Hi I have been having problems connecting to the internet and that now seems to be ok, when I try to send an email or reply to an email I get this error message: 550 RCPT TO> Relaying not allowed - please use SMTP AUTH I have spoken to |Tiscali, and I can connect on their site to send and...- Ronald
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- email issues internet access outlook smtp auth tiscali support
- Replies: 1
- Forum: Windows Help and Support