Author: Christian Gregoire Date: To: exim-users Old-Topics: Re: [exim] EHLO loop Subject: [exim] Re : EHLO loop
>> One of my clients' MTA is going mad from time to time, issuing 'EHLO
>> <name>' command in a never-ending loop. Exim politely answers with
>> the SMTP banner and the extensions available.
>>
>> Is there an option equivalent to smtp_accept_max_per_connection to
>> limit the number of EHLO/HELO commands in a single SMTP connection ?
>
>No, but as with most things, you can build that yourself. Put something
>like that in your acl_check_helo:
>
>deny
> set acl_c_helo_count = ${eval10:0$acl_c_helo_count+1}
> condition = ${if > {$acl_c_helo_count}{2}}
> message = Too many HELO/EHLOs
>
>Note that this allows 3 HELOs and you should probably not increase it,
>as clients will re-issue a HELO after STARTTLS and the counter is not reset.
>Feel free to limit this to your internal network with "hosts =
>so.me.net.work/mask", slow down the client with "sleep" or use "drop"
>instead of "deny".
