Mails come with delay

[Trejko89]

Hi!
Messages are sent to my inbox with a considerable delay.
The worst part is that I don't see any rule for it. E-mails appear between messages that have been previously downloaded.
The sender does not really matter here, because when writing 6 e-mails on the same day with the same user, one message arrived on the next day between the remaining e-mails.
I've tried repairing a folder, changing profile, reinstalling Thunderbird but it always looks the same. I also contacted my hosting, they actually have emails in their logs as they should.
Any ideas?

[DanRaisch]

Sorry but your post is a bit confusing. What sort of length of delay are you experiencing? On what are you basing the "Sent" time of the messages? You speak of writing 6 emails but then speak of messages arriving? Are you referring to messages you are sending and copying yourself on? Are you dealing with a single email account or multiple accounts? If multiple, are they all with the same provider or different email providers?