On 14/09/2021 04:29, raf wrote:
On Tue, Sep 14, 2021 at 01:20:03PM +1000, raf <post...@raf.org> wrote:
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But chances are that mail clients just do what any other TCP client would do. That might be why you can't find any discussion on the topic. Remember, the only IP address(es) that the mail client will be concerned with is that of its smarthost. In most cases, that will be an ISP that only has to deal with its own customers, not the whole planet, so there will usually only be one IP address (or one per region). So the mail clients might not have ever needed to put much thought into it. cheers, raf
Big assumption based on one example of gmail.com. Try outlook.com: [root@server ~]# dig -t a outlook.com <snip> ;; ANSWER SECTION: outlook.com. 120 IN A 40.97.128.194 outlook.com. 120 IN A 40.97.161.50 outlook.com. 120 IN A 40.97.164.146 outlook.com. 120 IN A 40.97.148.226 outlook.com. 120 IN A 40.97.160.2 outlook.com. 120 IN A 40.97.156.114 outlook.com. 120 IN A 40.97.153.146 outlook.com. 120 IN A 40.97.116.82 <snip>
