Error while sending a mail from mutt

[AYAN KUMAR HALDER]

On Thu, Mar 30, 2017 at 3:15 AM, Okash Khawaja <okash.khawaja at gmail.com> wrote:
>
>> On 29 Mar 2017, at 21:19, Jim Davis <jim.epost at gmail.com> wrote:
>>
>> On Wed, Mar 29, 2017 at 12:32 PM, AYAN KUMAR HALDER
>> <ayankumarh at gmail.com> wrote:
>>> Hi,
>>>
>>> I am trying to send a mail using mutt. I am getting the error as follows :-
>>>
>>> SMTP session failed: 501 5.5.4
>>>
>>> I understand the error meant that a valid mail transaction protocol
>>> was used with invalid arguments. Please let me know how do I debug
>>> this issue further.
>>
>> Mutt usually invokes some other program to send mail -- on my
>> workstation, for instance, that other program is /usr/sbin/sendmail:
>>
>> [jim at krebstar ~]$ mutt -v | grep '^SENDMAIL'
>> SENDMAIL="/usr/sbin/sendmail"
>>
>> so to debug a similar problem on my workstation I'd first look to see
>> where sendmail (or whatever program your mutt installation uses) logs
>> its messages.
>>
>> That used to be in /var/log/maillog or such; nowadays you might have
>> to run journalctl instead.
>>
>> For example, if I try
>>
>> mutt postmaster at example.com </dev/null
>>
>> on my workstation, then
>>
>> journalctl | grep sendmail
>>
>> tells me
>>
>> Mar 29 12:59:06 krebstar.arl.arizona.edu sendmail[27263]:
>> v2TJx61J027263: to=postmaster at example.com, ctladdr=jim (1000/1000),
>> delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30294,
>> relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection
>> refused by [127.0.0.1]
>>
>> which reminds me I don't actually have the sendmail service running.
>
> You can check ~/.muttrc file to see what it is using to send emails. If it is using sendmail or esmtp, then in .muttrc file where it specifies sending program you can append -X /path/to/log/file. That will output the whole SMTP dialog to that log file.

In my case, I get the following error messages in /var/log/mail.log
Mar 30 15:39:55 ayankh-X553SA postfix/sendmail[24765]: fatal: usage:
sendmail [options]
Mar 30 15:40:17 ayankh-X553SA postfix/sendmail[24891]: fatal: usage:
sendmail [options]

How do I see what arguments are being sent by mutt to sendmail.
Is there any quicker way by which I can get mutt working fine.