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Could not send email to office 365

On 2013-05-02, at 02:42, Cathy Almond <cathya at isc.org> wrote:

> 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

... or there's a NAT or some other box in front of the recursive server which re-writes the source port...

> ).  Might be worth checking what the
> recursive server you're using is doing?
> See https://www.dns-oarc.net/oarc/services/porttest