.SH SYNOPSIS
-\fBemail-validator\fR [\fB\-ha\fR] [\fB-i \fIFILE\fR] [\fB-o \fIFILE\fR] \fI<input>\fR
+\fBemail-validator\fR [\fB\-har\fR] [\fB-i \fIFILE\fR] [\fB-o \fIFILE\fR] \fI<input>\fR
.SH INPUT
.SH DESCRIPTION
.P
-We check the validity of an email address using three techniques:
+Validate an email address using three techniques:
.IP \[bu] 2
-We ensure that the length of local and domain parts is within the
+Ensuring that the length of local and domain parts is within the
RFC-specified limits.
.IP \[bu]
-A regular expression is used to check for invalid characters and syntax.
+A syntax check using a regular expression, or the full RFC 5322
+grammar (see the \fB\-\-rfc5322\fR option).
.IP \[bu]
-We confirm the existence of a MX record for the domain part of the
-address. This is not required; in fact many domains accept mail via
-an 'A' record for e.g. example.com which is used in lieu of an MX
-record. This behavior can be controlled via the \fR\-a\fR flag.
+Confirmation of the existence of an \fIMX\fR record for the domain
+part of the address. This is not required; in fact many domains accept
+mail via an \fIA\fR record for e.g. example.com which is used in lieu
+of an \fIMX\fR record. This behavior can be controlled via the
+\fR\-\-accept\-a\fR flag.
.P
These checks are performed in parallel using the number of available
-threads.
+threads. To increase the number of threads, you can pass the
+appropriate flag to the GHC runtime.
+
+.P
+This will set the number of threads to 25:
+
+.nf
+.B $ email-validator -i addresses.csv +RTS -N25
.SH OPTIONS
Specify the output file to which the good addresses will be written,
rather than using stdout (the default).
+.IP \fB\-\-rfc5322\fR,\ \fB\-r\fR
+Verify addresses against RFC 5322 rather than a naive regular
+expression. This is much more lenient than the default.
+
.SH BUGS
.P