Mail DNS SPF question

we are a billing company and need to send large volumes of mail to various people from various companies.

We have recently started to use to send our mail, but this is going very slow 3 emails per minute.

To improve delivery, here is your SPF information to add to your DNS settings:
SPF record: "v=spf1 ?all"
If any questions or concerns arise, please do not hesitate to contact us.

will adding this record affect our current mail set up?
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JoeNuvoConnect With a Mentor Commented:
should not have any affect with your mail setup.

by adding above SPF to your DNS
it will tell other mail server that

"my domain allowed to send e-mail out by server defined under"

possible for e-mail may sent out faster, expecting that other mail server (which receive your e-mail)
will perform less check with proper SPF record defined.
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