Re: Could not send email to office 365

[Cathy Almond <cathya () isc org>]

On 01/05/13 10:21, ISHII, Yuji wrote:
> Hello folks,
>
> Have you ever seen DNS issues on Office 365?
>
> MX record of Office 365 is example.mail.eo.outlook.com.
> I can get the MX record, however, I could not get the A record of the MX
> record, got Timeout.
>
> Does anyone have the same issue?
>
> Sincerely,
> Yuji
This may be a red herring, but I've heard of some dropping of DNS
queries for the names within outlook.com domains where the queries are
all coming from source port 53 (i.e. your recursive server doesn't use
query source port randomization).  Might be worth checking what the
recursive server you're using is doing?

See https://www.dns-oarc.net/oarc/services/porttest

Cathy