email blacklisted - what next

my website has been hacked and then it has been marked as a spammer. I have successfully removed it from some spamminglist and now it shows the sitename is clean.. what are the next steps i should do ? is their any mailing server where i can point my mx record who is whitelist safe(100%) ? any advice is welcome, currently i am unable to receive mails from some of my clients which is a huge loss for me
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Sam SungAsked:
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Scott CSenior EngineerCommented:
Contact your ISP and make sure you're not still being blacklisted with them.
Sam SungAuthor Commented:
I am unsure why i should contact my ISP ? I am able to send mails to some, while some of my clients are not able to send mails ? Its not professional to ask all my clients to whitelist me..
Justin DurrantSr. Engineer - Windows Server/VirtualizationCommented:
Start with ISP.. then run through this:

https://www.spamhaus.org/lookup/
http://www.dnsbl.info/
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Trent SmithCommented:
Use the MXtoolbox site to check if you are blacklisted.
http://mxtoolbox.com/blacklists.aspx

If you are blacklisted you will have to contact your ISP so they can lift that restriction.  Some sites won't let you deliver messages if you have been blacklisted.  You will have to probably fill out a form and of course they will tell you it will take XX amount of time to remove you.  It typically goes fairly quick however.
Sam SungAuthor Commented:
I have been removed from the blacklist 2 days ago, how ever i am not getting emails from some clients.. the clients complain that they have send mails but i am not answering them.

after that i would like to go for a professional mail server soloution who can host me, and who is whitelisted.. can you suggest any? in europe or denmark.
Trent SmithCommented:
Look at SpamSoap.com
Sam SungAuthor Commented:
none of the above suggestions have actually answered my question..

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Sam SungAuthor Commented:
there were to suggestions:
1) clear blacklist ( i have already done that as stated in my question)
2) clear ISP ( ISP will block outgoing and not incoming mails)
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