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SPF record optimisation for office 365.

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Hi folks  need some assistance optimizing my <g class="gr_ gr_12 gr-alert gr_spell gr_run_anim ContextualSpelling ins-del multiReplace" data-gr-id="12" id="12">spf</g>  record as its failing due to too many DNS lookups

this is the current record.

v=spf1 a mx ptr include:servers.mcsv.net include:spf.mandrillapp.com include:outlook.com include:spf.messaging.microsoft.com include:spf.messagelabs.com -all

And yes <g class="gr_ gr_18 gr-alert gr_tiny gr_spell gr_run_anim ContextualSpelling multiReplace" data-gr-id="18" id="18">i</g> know, a <g class="gr_ gr_21 gr-alert gr_spell gr_run_anim ContextualSpelling ins-del multiReplace" data-gr-id="21" id="21">mx</g> and ptr shouldn't be there.

The problem is outlook.com and messaging.microsoft.com. are there more direct entries <g class="gr_ gr_30 gr-alert gr_tiny gr_spell gr_run_anim ContextualSpelling multiReplace" data-gr-id="30" id="30">i</g>  could use, exmaple _spf-b etc... OR are these two even required if all the company does is use office 365 for Archiving, no mail is sending out through Office365.



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