On Mon, Sep 13, 2021 at 07:58:26AM -0400, Wietse Venema wrote:

> > When a user clicks "send", the email client has to make some
> > tcp-connection to some ip address.  What if the hostname configured
> > at the email client resolves to multiple ip addresses?
> 
> It just seems unlikely that major email service providers would run
> all their submission services on a single IP address.

With "smtp.gmail.com" one IP address is returned at a time, but it
appears to be GeoIP-dependent:

    NYC:    smtp.gmail.com. IN A 209.85.232.109  ;  15ms RTT
    LA:     smtp.gmail.com. IN A 142.251.2.108   ;  8ms  RTT
    München smtp.gmail.com. IN A 108.177.119.109 ;  15ms RTT

-- 
    Viktor.

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