troubleshooting Question

External -> Internal mailboxes cease at approx. the same time each day (this weekend though all has stopped)

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chromenewt asked on
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I have a general question which has been plaguing us since we changed ISP and I'm hoping someone knows at least the possible cause so I can sort it/leave stern messages with the right people.

At approximately 11am each day (sometimes earlier/later but mainly at that time) we cannot recieve emails from the outside world. We can send each other internal emails no problems, and when we send emails to outside addresses they arrive straight away (tested by sending to various staff home accounts like gmail and hotmail). When we try to reply/send fresh mails from these account we find that again we cannot recieve them at work.

Suddenly, after about 2 hours, they all come flooding in. The problem dissappears until the following day. The only differences from this pattern is it seems that at the weekends we get intermittant mails trickling in (usually spam though). The problem at the moment we have is that since 8am Saturday it hasn't worked.

Anyone know what could cause this? I'd be very appreciative of any suggestions since I'd like to be able to get the ISP sorted or internal gubbins if it's something here. Set-up wise we have an exchange server that goes through an intY exo-server and then through to the ISP. We've spoken to intY and they've been very helpful although they cannot connect to us for some reason despite their instructions. They could with the previous ISP's service and equipment.

Any ideas? I'm assigning 500 points to this as we have an EV coming in tomorrow and we need service back up asap. Thank you all in advance

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