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email:troubleshooting:error-numbers:501 [2015/02/04 14:42]
email:troubleshooting:error-numbers:501 [2015/02/04 14:44] (current)
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-====== SMTP Error 500 ====== +====== SMTP Error 501 ====== 
-Description:​ <​blockquote>​Syntax error, command unrecognized (This may include errors such as command line too long)</​blockquote>​+Description:​ <​blockquote>​Syntax error in parameters or arguments</​blockquote>​
 ==== What does this mean? ==== ==== What does this mean? ====
-The receiving SMTP mail server was unable ​to correct process the command(s) received. Also notecommands ​that are processed but not used will be handled with different response numbers.+This is similar ​to Error **[[email:​troubleshooting:​error-numbers:​500|#​ 500]]**although this is specific to the additional '​parameters'​ or options ​that are being used. 
-==== How to fix SMTP Error 500 ==== +==== How to fix SMTP Error 501 ==== 
-The unrecognized command response ​is typically in regards ​to antivirus or firewall software. To confirm if this is the case, temporarily disable each one, re-instating them if not the area of concern.+This is most commonly an issued with an incorrect/​invalid email address, however can also be due to anti-spam filters as referenced in the similar Error **[[email:​troubleshooting:​error-numbers:​500|#​ 500]]**. If you've confirmed a correct email address, I suggest reviewing ​the fixes for Error **[[email:​troubleshooting:​error-numbers:​500|#​ 500]]**.
-==== SMTP Error 500 Examples ==== +==== SMTP Error 501 Examples ==== 
-<​code>​SMTP Permanent Error500 Access Denied By Port Access</​code>​ +<​code>​Remote host said501 Invalid Address</​code>​ 
-<​code>​SMTP Error 500 Line too long</​code>​+ 
 +=== Similar ​SMTP Errors === 
 +**[[email:​troubleshooting:​error-numbers:​500|# 500]]** 
email/troubleshooting/error-numbers/501.txt · Last modified: 2015/02/04 14:44 by dlevey