...

Of course, we don't expect you to have a sudden fit of loyalty towards our company, but at least we hope for a closer and better relationship in the future.

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Note added at 28 mins (2014-09-21 21:22:25 GMT)
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Of course, we don't expect you to have a sudden fit of loyalty towards our company upon the receipt of our letter, but at least we hope for a closer and better relationship in the future.

Just my non-native take on it. Like in "We certainly don't expect you to feel a sudden rush/onrush of whatever..." It sounds awfully informal too, but then the source sort of allows it?

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Note added at 49 mins (2014-09-21 21:43:42 GMT)
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On the second thought, there's a possibility that the author didn't intend this line to sound light or playfully (since the second part of the same sentence is all business). I guess we can as well replace the original “припадок лояльности” with more businesslike “we certainly do not expect you to put an instant trust in our company, but…” . Or “we certainly don’t expect you to develop an instant faith in us, yet…”

...what do you think?

"We don't expect you to be stricken with..."

I've often found "loyalty" to be a false friend, in marketing contexts such as this. I agree that "приступ" gives it a casual tone, so I'd propose something like this:

Of course we don't expect this one letter to make you head over heels for our company, but...

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Note added at 2 hrs (2014-09-21 23:18:35 GMT)
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Or, spell out the idiom by adding "fall" - "don't expect you to fall head over heels for our company just because of this letter, but..."



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Note added at 2 hrs (2014-09-21 23:20:56 GMT)
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And if you do decide that it should sound more businesslike, then - "Of course we don't expect to win your trust with this letter alone, but..." But steer clear of "loyalty."

Употребление слова "лояльность" в оригинале вызывает сомнения в том, ходил ли автор в среднюю школу.

Просто для разнообразия вариантов. :)
И для увеличения количества вариантов без слова loyalty (я не думаю, что оно здесь такой уж ложный друг, но можно попробовать и без него).

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Note added at 18 hrs (2014-09-22 15:14:55 GMT)
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Rachel, yes, I agree, too many words! I was just playing a bit and expanding "loyalty-less" options :).

The funny thing is, "loyalty" in Russian is also supposed to imply something more or less long-lasting. The major difference is, in Russian "loyalty" usually applies to organizations and institutions; it does not apply well to personal relationships (if at all).

However, marketing and sales people - both in Russian and in English - love to bend the meaning of words and may talk about instant loyalty and similar stuff. That's why I suspect that it's not the most outrageous mismatch around. The original phrase here is certainly bending the words and striving for humorous effect.

(Also, clients who regularly work with Russian partners tend to get accustomed to the peculiarities of Russian usage of English words; however, one certainly should not base translation on this, unless one knows the client really well)

You're not looking for the English world loyal. You're looking for the word trust. You're not saying, "We don't expect you to be "predanyj". The actual meaning that the Russian sentence is trying to convey is "my konechno ne dumaem shto vy nam srazy budete doverjat"

Translation: Of course, we don't expect that after this email you will suddenly put your full trust in our company (or you can say full faith or you can say "... after this email you will all of a sudden fully trust our company or suddenly trust our company fully)
However, we can use this occasion as a stepping stone (or starting point) to establishing stronger and deeper ties (or you could say to a closer working relationship).

There are so many ways to say the same thing. :)