> On 4 Feb 2025, at 01:46, Theo de Raadt <deraadt@openbsd.org> wrote:
> 
> Vitaliy Makkoveev <mvs@openbsd.org> wrote:
> 
>>> On 4 Feb 2025, at 01:22, Theo de Raadt <deraadt@openbsd.org> wrote:
>>> 
>>> What is the point of this 'validation'?
>>> 
>>> If the environment variable is trash, the mail doesn't work.
>> 
>> To prevent silent e-mail loss. The "sendmail: command failed: 501
>> 5.1.3 Recipient address syntax error" in the syslog looks not
>> correlating with calendar(1) to me.
>> 
>> Anyway, my question is not requirement, right?
> 
> If a user, in trying to redirect output away from their tty, misconfigures
> to create such a ridiculous failure, is there any requirement that they
> receive a problem report?
> 

No :)

I have objections against initial diff. Do you?