[CentOS] Sendmail failing on home machine

Christopher Chan wrote:
>
>> configure your sendmail to use your ISP's mail server as a 'smarthost'.
>>
>
> How is that going to help the dest mta verify his address?

it won't have to.      his ISP will accept mail from its own customer's 
IP address, same as if they were end user mail clients, and it will 
relay for him.   the destination MTA will presumably accept mail from 
his ISP's mail server, unless they are a known spammer.