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mailx recipient restriction

 
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# 1  
Old 09-05-2008
mailx recipient restriction
maybe a simple question, but i've looked around and not been able to find anything.

is there a restriction on how many recipients can be used in a single mailx command? whether it's a numeric restriction or a size restriction (like 256k for the whole recipient parameter).

thanks a lot.
# 2  
Old 09-05-2008
It is the number of bytes that the shell can pass to a child process via exec that counts.
Try the following command on your system:
Code:
getconf ARG_MAX
getconf _POSIX_ARG_MAX

My system shows 2080000 and 4096. Your system will enforce the first one, but some open source apps may opt for #2. You mailx uses #1.
# 3  
Old 09-05-2008
thank you so much.
# 4  
Old 09-05-2008
There may be rate-limiting down the road, though. The To: header should not be over 1,024 characters long, but you can have multiple To: headers if this is a problem (or use Bcc: or whatever). What's more complicated is if your MTA limits how much you can send; some ISPs do this as a matter of controlling abuse (spam and virus-generated spewage).
# 5  
Old 09-09-2008
thanks for the info.
just out of curiosity...what unit of measure is ARG_MAX in? i'm assuming bytes, but wanted to make sure. a google search wasn't very helpful Smilie .
Thanks
# 6  
Old 09-09-2008
ARG_MAX is bytes.
# 7  
Old 09-09-2008
thanks so much
 
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