Email addresses get change when leaving the mailservers

I have a weird issue with some users sending emails to another company. The Exchange Admin from the other company sent me the message header where apparently when our users send messages to the user in the other company it adds an a dot/period in the middle of their last name of their email addresses. e.g. firstname.last.name@domain. When it should be fistnam.lastname@domain I have no idea where to start researching this issue. Because of that the emails never get to the intended recipients and get caught in their spam filter. I will really appreciate in anyone can help me with this.
EsmeraldaAmayaAsked:
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SembeeCommented:
That isn't something I have seen Exchange do, so I would start looking outside of Exchange. Do your messages go through a smart host? Is it just that one email address it happens with?

Simon.
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EsmeraldaAmayaAuthor Commented:
Yes all messages go through a smart host and no, that is not the only email it has panned with. The estrange thing is that we are not having this problem with any other domains. It always happens with the same @domain. The header this person sent me is very confusing to understand so I'm not sure if it is us or them. and of course they seem to think is us.
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SembeeCommented:
If your email messages go through a smart host, then it is always the first place to pin the blame on.
If the other side isn't' running any kind of strict antispam filters then you could adjust the SMTP Connectors so that you can introduce a second one which sends email to that domain directly, rather than through a smart host. If the problems continue that rules out the smart host.

Simon.
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EsmeraldaAmayaAuthor Commented:
I really appreciate your possible solutions.  I had no idea were to start. We found that the problems were the machines. We have no idea what caused the email addresses to get extra characters. It was either a space or a dot that got inserted in the email addresses. We found out the problems were in the laptops because one of the users that started having the problem had two machines and only one of his machines was having the issue. Once we re-image his system the problem disappears. I thought I would let you know in case you come across with an issue like this. Thank you Sembee and Simon for your assistance.
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