I'm approving this thread to say that this hadith is fabricated and falsely attributed to the Prophet (PBUH) and it should not be sent around the world through emails, as this is exctally whats been happening since the past few years. Below is from islamQA.com.
Praise be to Allah.
The hadeeth, “Whoever neglects prayer, Allah will send fifteen punishments upon him, six in this world, three when he is dying, three in the grave and three when he emerges form the grave…” is a fabricated (mawdoo’) hadeeth which is falsely attributed to the Messenger of Allah (saws).
Concerning this hadeeth Ibn Baz (rh) said, in the magazine al-Buhooth al-Islamiyyah (22/329): With regard to the hadeeth which the author of this pamphlet attributes to the Messenger of Allah (saws) concerning the punishment of the one who does not pray, and which says that fifteen punishment will be sent upon him etc., this is one of the fabricated ahadeeth that are falsely attributed to the Prophet (saws), as was stated by the scholars such as al-Hafiz al-Dhahabi in Lisan al-Meezan, and al-Hafiz ibn Hajar and others.
Similarly the Standing Committee issued a fatwa, no. 8689, declaring this hadeeth to be false, as it says in Fatawa al-Lajnah, 4/468. Among the things mentioned in this fatwa which it is worth quoting here is:
What has been narrated from Allah and from His Messenger concerning the punishment of the one who does not pray is sufficient. Allah says (interpretation of the meaning):
“Verily, As‑Salah (the prayer) is enjoined on the believers at fixed hours
” [al-Nisa’ 4:103]
And Allah says of the people of Hell (interpretation of the meaning):
“ ‘What has caused you to enter Hell?’
They will say: ‘We were not of those who used to offer the Salah (prayers)’
” [al-Muddaththir 74:42-43]
and He mentioned among their attributes the fact that they did not pray.
The Prophet (saws) said: “The covenant that stands between us and them is prayer; whoever gives up prayer is a kafir.
” Narrated by al-Tirmidhi, 2621; al-Nasa’i, 431; Ibn Majah, 1079. classed as saheeh by al-Albani in Saheeh al-Tirmidhi, 2113. And there are other verses and ahadeeth which speak of giving up prayer, and the Prophet (saws) described it as kufr.
See also question no. 2182
Shaykh Ibn ‘Uthaymeen (rh) said: This hadeeth is mawdoo’ (fabricated) and falsely attributed to the Messenger of Allah (saws). It is not permissible to propagate it unless it is accompanied by a statement that it is fabricated, so that the people will have a clear understanding about it.
Fatawa al-Shaykh published by the Daw’ah center in ‘Anayzah, 1/6
We ask Allah to make you steadfast in your keenness to call your brothers and advise them, but you have to make it clear to everyone who is keen to do good for the people and to warn them against evil that it must be done in accordance with that which is proven from the Prophet (saws) and that there is sufficient material in the saheeh reports that we have no need for the da’eef (weak) material.
We ask Allah to grant you success and to guide those whom you call and all the Muslims to follow the straight path.
And Allaah knows best.
IslamQA.com - (Click here to go to the source page)
EDIT: I'm re-opening this thread to bump it up so as to make everyone aware insha'Allah.