On Wed, Jan 29, 2020 at 08:45:35PM +0100, Jos Chrispijn wrote: > Can someone tell me what this server tries to accomplish: > > COMMAND PIPELINING from [183.89.214.13]:44487 after ???: > \000\234\000\235\000/\0005\300\022\000\n\001\000\000d\000\000\000\023\000\021\000\000\016mail.some.net\000\005\000\005\001\000\000\000\000\000\n\000\n\000\b\000\035\000\027\000\030\000\031\000\v\000\002\001\000\000\r\000\030\000\026\b\004\b\005\b\006\004\001\004\003\005\001\005\003\006\001\006\003\002\001\002\003\377\001\000\001
That's not enough context to tell. Would need to know the preceding sequence. If this keeps happening, you'll need to make a PCAP capture of an SMTP session from that server. -- Viktor.