email - Mail rejected with "Client host rejected: MX-CIDR" -

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i trying send mails mailgun. dns config (spf,dkim) seems ok , being validated in mailgun service. can send mail several users gmail, live , others mail providers. however, have problem when sent email email accounts of university.

the message rejected following alert:

"554 5.7.1 : client host rejected: mx-cidr"

my current dns settings are:

txt @ "v=spf1 include:mailgun.org ~all" mx 10 mxa.mailgun.org. mx 10 mxb.mailgun.org.

dkim validated well. checked domain @ mxtoolbox , dns config pass in tests. did not find errors related alert in others questions. may me fix it?

update 1: more informations:

1) dont send, , have absolutely no intention send spam. created educational website, used students , instructors, , send messages between each others. send mail confirm registers, recovery password, lot of others websites do. send messages people agreed terms of service, includes information mail policy. small service, never sent more 2,000 messages in month (i have 800 registered users far)

2) not believe blacklisted, mxtools verify several blacklists databases , ip have passed in verifications. also, server not rejecting messages ip, can send messages personal email same domain, use different services handle personal inbox domain , emails send website. so, guess may dns record mistake.

3) use mailgun (or others transactional email services mandrill or sendgrid) because highly recommended (and easy). use small vps , hard configure own email service (i programmer, not expert in kind of configuration). if exists negative factors use of these systems, know , learn more.

i see no evidence posted reason receiving mail server rejecting mail because of spf records.

there isn't evidence here receiving mail servers performing spf checks on incoming mail.

can explain why believe has spf?

just because someone's rejecting mail, , happen messing around spf records, doesn't mean reason mail being rejected due spf records.

the ones can tell why email being rejected, , needs done fix it, receiving mail servers' administrators, , that's should asking. ones know how mail servers configured, , how work. unless it's evident text of error message, , it's not, else's answer nothing guesswork.

and guess that, if anything, error message seems suggest have blacklisted ip address range, period, whatever reason. interpret "mx-cidr" meaning "mx's ip address' (you can google "cidr" means yourself); i.e.: sending mail server's ip address explicitly blacklisted sending them mail.

now, taking referenced domain's web site, quote:

"our software automatically manages delivery process give emails best chance of landing in inbox."

i think type of folks concerned having "the best chance of landing in" inbox typical spamming parasites. browsed through referenced website, , couldn't shake off slimy feeling after typically wandering typical spam spewer.

is domain being used send spam?

if so, know answer question, already.


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