I have something like this in my header checks:

/^Content-(Disposition|Type):\s+.+?(?:file)?name="?.+?\.(386|ad[ept]|app|as[dpx]|ba[st]|bin|btm|cab|cbt|cgi|chm|cil|cla(ss)?|cmd|cp[el]|crt|cs[chs]|cvp|dll|dot|drv|em(ai)?l|ex[_e]|fon|fxp|hlp|ht[ar]|in[fips]|isp|jar|jse?|keyreg|ksh|lib|lnk|md[abetw]|mht(m|ml)?|mp3|ms[ciopt]|nte|nws|obj|ocx|ops|ov.|pcd|pgm|pif|p[lm]|pot|prg|reg|sc[rt]|sh[bs]?|slb|smm|sys|url|vb[esx]?|vir|vmx|vxd|wm[dsz]|ws[cfh]|xms|\{[\da-f]{8}(?:-[\da-f]{4}){3}-[\da-f]{12}\})\b/
       REJECT hc1 ".$2" file attachment types not allowed

I need to allow '.eml' files, is this the expresion that is stopping them:

em(ai)?l

does it mean 'eml and/or ail' ?
what's an 'ail', is there such attachement ?
-- 
Voytek
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