Should he send blessings upon the Prophet (peace and blessings of Allaah be upon him) when he makes du’aa’ in his sujood?
Question

                I know that one of the requisites of making Du'a is sending prayers on the Prophet Muhammad (S) and the Du'a is blocked from the heavens until one sends prayers on him (S). Is this is general ruling? What is one wants of make Du'a during sujood (prostration), does one send prayers on the Prophet during that posture as well?
Praise be to Allah.According to Islamic teaching, du’aa’ (supplication) 
          may be divided into two categories, general and specific.
 General du’aa’ is that which may be 
          initiated by the individual, in which he may say whatever he wants, 
          at certain times or in certain places prescribed by sharee’ah, such 
          as making du’aa’ in the last third of the night, or making du’aa’ between 
          the adhaan (call to prayer) and iqaamah (second call immediately preceding 
          the prayer), or making du’aa’ at ‘Arafaah, and so on.
 The specific kind of du’aa’ is du’aa’s 
          which are said when entering or leaving a place, when certain things 
          happen, and so on, such as when entering and leaving the toilet, when 
          the wind blows strongly, and so on.
 The first kind, general du’aa’s, are 
          those in which blessings should be sent upon the Prophet  
          (peace and blessings of Allaah be upon him). They should also include 
          praise of Allaah. Faddaalah ibn ‘Ubayd said: “The Messenger of Allaah 
           (peace and blessings of Allaah 
          be upon him) heard a man making du’aa’ in his prayer, but he did not 
          praise Allaah or send blessings on the Prophet  
          (peace and blessings of Allaah be upon him). The Messenger of Allaah 
           (peace and blessings of Allaah 
          be upon him) said: ‘This man is in a hurry.’ Then he called him or someone 
          else and said, ‘When any one of you prays, let him begin by praising 
          his Lord, then let him send blessings on the Prophet  
          (peace and blessings of Allaah be upon him), then let him pray for whatever 
          he wants after that.’”
(Narrated by al-Tirmidhi, 3477, and Abu Dawood, 1481)  
          
The context of sending blessings on the Prophet 
           (peace and blessings of Allaah 
          be upon him) was mentioned by the great scholar Ibn al-Qayyim (may Allaah 
          have mercy on him), who said:
“Blessings should be sent upon him before supplication 
          and after praising Allaah.
The second place is to send blessings upon him at the 
          beginning of the du’aa’, in the middle and at the end.
The third place is to send blessings upon him at the 
          beginning and at the end, and to mention one’s need in the middle.”
(Jalaa’ al-Afhaam, 
          p. 375)  
With regard to the reason for sending blessing 
          upon the Prophet  (peace and blessings 
          of Allaah be upon him) in du’aa’, Shaykh al-Islam Ibn Taymiyah (may 
          Allaah have mercy on him) said:
“Sending blessings upon him is one of the greatest means 
          of having du’aa’s answered, and this has been enjoined by Allaah. Sending 
          blessings upon him in du’aa’ is what is indicated by the Qur’aan, Sunnah 
          and ijmaa’ (scholarly consensus). Allaah says (interpretation of the 
          meaning);
‘Allaah 
          sends His Salaah (Graces, Honours, Blessings, Mercy) on the Prophet 
          (Muhammad), and also His angels (ask Allaah to bless and forgive him). 
          O you who believe! Send your Salaah on (ask Allaah to bless) him (Muhammad), 
          and (you should) greet (salute) him with the Islamic way of greeting 
          (salutation, i.e. As‑Salaamu ‘Alaikum)’ 
[al-Ahzaab 33:56].”
(Majmoo al-Fataawa, 
          1/347) 
 Ibn al-Qayyim said:
In these contexts in which it is prescribed to send blessing 
          upon the Prophet  (peace and blessings 
          of Allaah be upon him), it is prescribed to send blessings upon the 
          Prophet  (peace and blessings of 
          Allaah be upon him) before starting the du’aa’. The key to du’aa’ is 
          sending blessings upon the Prophet  
          (peace and blessings of Allaah be upon him), just as the key to salaah 
          (prayer) is purity. So may Allaah send blessings and peace upon him 
          and his family.  
With regard to the specific kind of du’aa’s mentioned 
          above, these do not include sending blessings upon the Prophet  
          (peace and blessings of Allaah be upon him), except in a few cases such 
          as the du’aa’ for entering the mosque and the du’aa’ after the adhaan, 
          as will be quoted below.  
The Prophet  
          (peace and blessings of Allaah be upon him) taught his ummah 
          specific du’aa’s for certain times and certain actions, in which there 
          is no sending blessings on the Prophet  
          (peace and blessings of Allaah be upon him). These include:
Du’aa’ 
          al-istikhaarah:
 It was narrated that Jaabir ibn ‘Abd-Allaah 
          (may Allaah be pleased with them both) said: The Messenger of Allaah 
           (peace and blessings of Allaah 
          be upon him) taught us to pray for guidance in all our affairs, just 
          as he would teach us a soorah from the Qur’aan. He said: “If any of 
          you intends to undertake a matter, then let him pray two non-obligatory 
          rak’ahs, then let him say:
‘Allaahumma inni astakheeruka 
          bi ‘ilmika wa astaqdiruka bi qudratika, wa as’aluka min fadlik al-‘azeem 
          fa innaka taqdiru wa laa aqdir, wa ta’lamu wa laa a’lam, wa anta ‘allaam 
          ul-ghuyoobi. Allaahumma in kunta ta’lamu anna haadha’l-amra 
          – and here he mentions his need – khayrun 
          li fi deeni wa ma’aashi wa ‘aaqibati amri (or he said, ‘aajil amri wa aajilihi), faqdirhu 
          li wa yassirhu li thumma baarik li fihi. Wa in kunta ta’lam anna hadha’l-amra 
          sharrun li fi deeni wa ma’aashi wa ‘aaqbiti amri (or he said, 
          ‘aajil amri wa aajilihi), 
          fasrifhu ‘anni wasrifni ‘anhu waqdir 
          li al-khayr haythu kaana thumma ardini bihi
(O Allaah, 
          I seek Your guidance by Your knowledge and I seek strength by Your power. 
          I ask you of Your great Bounty. You have power, I have none, You know, 
          I know not. You are the Knower of the Unseen. O Allaah, if You know 
          that this matter – and here he should mention it – is good for me in 
          my religious commitment, my livelihood and my affairs (or he said, immediately 
          and in the distant future), then decree it for me, make it easy for 
          me and bless it for me. And if you know that this matter is bad for 
          me in my religious commitment, my livelihood and my affairs (or he said, 
          immediately and in the distant future), then turn it away from me, and 
          turn me away from it, and decree for me whatever is good, wherever it 
          may be, and make me content with it).’”
(Narrated by al-Bukhaari, 1113) Du’aa’ when entering 
          the toilet:
 It was narrated that Anas ibn Maalik 
          (may Allaah be pleased with him) said: “Whenever he entered the toilet, 
          the Prophet  (peace and blessings 
          of Allaah be upon him) used to say, ‘Allaahumma 
          inni a’oodhu bika min al-khubthi wa’l-khabaa’ith (O Allaah, 
          I seek refuge with You from all evil and evildoers).”
(Narrated by al-Bukhaari, 5963; Muslim, 375) 
Du’aa’ when there are high winds:
 It was narrated that ‘Aa’ishah, the 
          wife of the Prophet  (peace and 
          blessings of Allaah be upon him) said: “Whenever there was a wind-storm, 
          the Prophet  (peace and blessings 
          of Allaah be upon him) would say, “Allaahumma 
          inni as’aluka khayrahaa wa khayra ma fihaa wa khayra maa ursilat bihi, 
          wa a’oodhu bika min sharrihaa wa sharri maa fihaa wa sharri ma ursilat 
          bihi (O Allaah, I ask You for its goodness, the goodness 
          within it and the good with which it was sent, and I seek refuge with 
          You from its evil, the evil within it and the evil with which it was 
          sent.”
 And there are other du’aa’s which he 
          taught us, in which there is no mention of sending blessings upon him, 
           (peace and blessings of Allaah 
          be upon him). We should recite them as he has taught them to us, without 
          adding anything or taking anything away. This ruling also applies to 
          making du’aa’ in sujood, which is mentioned in the question. Several 
          du’aa’s have been reported that the Prophet  
          (peace and blessings of Allaah be upon him) said in his sujood, none 
          of which contain blessings upon the Prophet  
          (peace and blessings of Allaah be upon him). These du’aa’s include the 
          following:
 It was narrated that ‘Aa’ishah (may 
          Allaah be pleased with her) said: “The Prophet  
          (peace and blessings of Allaah be upon him) often used to say in his 
          sujood and rukoo’: ‘Subhaanaka Allaahumma 
          Rabbanaa wa bi hamdika, Allaahumma ighfir li (Glory and praise 
          be to You, O Allaah our Lord; O Allaah, forgive me).’” (Narrated 
          by al-Bukhaari, 874; Muslim, 484). 
And it was narrated that ‘Aa’ishah said: “one 
          night I noticed that the Messenger of Allaah  
          (peace and blessings of Allaah be upon him) was not in his bed, so I 
          reached out looking for him, and my hand touched the soles of his feet; 
          he was in his prayer place and his feet were upright (i.e., he was prostrating), 
          and he was saying, ‘Allaahumma a’oodhu 
          bi ridaaka min sakhatika wa bi mu’aafaatika min ‘aqoobatika wa a’oodhi 
          bika minka laa uhsi thanaa’an ‘alayka anta kamaa athnayta ‘ala nafsika 
          (O Allaah, I seek refuge in Your good pleasure from Your wrath, and 
          I seek refuge in Your pardon from Your punishment. I seek refuge in 
          You from You. I cannot enumerate Your praise, You are as You have praised 
          Yourself).’”
(Narrated by Muslim, 486) 
Let us not forget also that the person who 
          is praying will recite al-salaah 
          al-Ibraaheemiyyah when he sits to recite the Tashahhud in 
          his prayer; thus his prayer will include sending blessings upon the 
          Prophet  (peace and blessings of 
          Allaah be upon him).
The specific du’aa’s which include sending 
          blessings upon the Prophet  (peace 
          and blessings of Allaah be upon him) include the following:
-Du’aa’ when entering the mosque:
It was narrated that Abu Humayd and Abu Usayd 
          said: The Messenger of Allaah  (peace 
          and blessings of Allaah be upon him) said: “When any one of you enters 
          the mosque, let him greet the Prophet  
          (peace and blessings of Allaah be upon him) with peace, then let him 
          say, ‘Allaahumma aftah li abwaab rahmatika (O Allaah, open to me 
          the gates of Your Mercy).’ And when he leaves, let him say, ‘Allaahumma 
          inni as’aluka min fadlika (O Allaah, I ask You of Your Bounty).’”
(Narrated by Abu Dawood, 466). 
(This hadeeth was classed as saheeh by Shaykh al-Albaani 
          (may Allaah have mercy on him) in Tamaam 
          al-Minnah, p. 290) 
Du’aa’ 
          following the adhaan:
 It was narrated that ‘Abd-Allaah ibn’Amr 
          ibn al-‘Aas heard the Prophet  (peace 
          and blessings of Allaah be upon him) say: “When you hear the muezzin, 
          say what he says, then send blessings upon me, for whoever sends blessings 
          upon me, Allaah will send ten blessings upon him. Then ask Allaah to 
          grant me al-waseelah, 
          which is a position in Paradise which will only be attained by one of 
          the slaves of Allaah, and I hope that I will be the one. Whoever asks 
          for al-waseelah for me, 
          my intercession will be granted for him.”
(Narrated by Muslim, 384) 
 And Allaah knows 
          best.